The usgs network of magnetic observatories monitored activity from the halloween storm in collaboration with international partners. the storm played tricks on technological systems around the world, which scientists continue to analyze even today. during the halloween storm, geomagnetic orientation used for directional drilling for oil and gas in alaska was disrupted, as were airborne magnetic and geophysical surveys around the world. interference with over-the-horizon radio communication even forced cancellation of airline polar routes and their diversion to lower latitudes. communication interference forced the department of defense to cancel a maritime mission. gps accuracy was significantly degraded, affecting land and ocean surveys, and commercial and military aircraft navigation. civilian and military satellites were put into a protective operating mode, other satellites were damaged, and a japanese scientific satellite was permanently disabled. astronauts onboard the international space station took precautionary shelter to avoid excessive levels of radiation. additionally, geomagnetically-induced currents in the earth's crust caused stress in the electric-power grids in north america, forcing system operators to take measures to prevent blackouts. source: which of the following correctly illustrates the central idea of this text? additionally, geomagnetically-induced currents in the earth's crust caused stress in the electric-power grids in north america, forcing system operators to take measures to prevent blackouts. civilian and military satellites were put into a protective operating mode, other satellites were damaged, and a japanese scientific satellite was permanently disabled. communication interference forced the department of defense to cancel a maritime mission. the storm played tricks on technological systems around the world, which scientists continue to analyze even today.

(20 points) passage: this year will be a record-breaking year for storms 1it looks like 2012 will be a year for the record books. thunderstorms, hurricanes, and tornadoes have increased across the country. the storms' high winds and heavy rains are making history. early tornado and hurricane seasons 2in march, not usually a busy month for tornadoes, the south and midwest had a large number of twisters. warm weather made conditions ripe for the creation of tornadoes. on some days, twisters dropped from the sky by the dozen. 3hurricane season also came early. two tropical storms hit the southeast in may. two more strong storms followed in june. severe thunderstorms 4many states that have escaped tornadoes and hurricanes have had severe thunderstorms. these giant storms dumped several inches of rain and caused flooding across the northeast and midwest. 5the end of hurricane season is months away, and this year's storm count and rainfall amounts could leave 2011 in the dust. forecasters say the wet, windy weather might stick around until fall. labor day parade rained out 6there is no joy in green town, where the annual labor day parade was called off because of heavy rain. the town's mayor says the parade hasn't been rained out in fifty years. 7a strong band of thunderstorms hit green town on sunday. more than two inches of rain fell each hour. by monday morning, main street looked more like a creek than a parade route. mayor nora bell said she had to call off the parade. "the heavy rains have created a serious safety issue in green town," she said. 8the loss of the labor day parade is green town's second disappointment this summer. in may, the memorial day parade was also called off because of rain. "this must be one of the wettest summers in history," mayor bell said. 9according to the national weather service, mayor bell is right. this summer will break rainfall records in green town and across the country. question: who would obtain the most useful information from the passage? a) someone planning a holiday picnic. b) someone interested in documenting annual meteorological patterns. c) an advocate for the green town labor day parade. d) someone who wishes to do research on the alleged truth of the "global warming" phenomenon.