As California scrambles for ways to cope with its crippling drought and the mandatory water restrictions imposed last month by Gov. Jerry Brown, an array of ideas that were long dismissed as too controversial, expensive or unpleasant are getting a second look. One is to conserve more water; another is to turn nearby and abundant sources of water, like the Pacific Ocean, into drinking water through desalination. Yet another is to recycle the water Californians have already used. And therein lies a marketing challenge that can be even greater than the technological one

–"Water Flowing from Toilet to Tap
May Be Hard to Swallow,”
John Schwartz

Which statement best summarizes the claim the author makes in the excerpt?

People actually love drinking recycled wastewater.
Wastewater is not easy to purify, but it is necessary for survival.
California is facing a drought that has greatly affected the water supply.
Convincing people to drink recycled water is a more difficult task than producing it.

Read this excerpt from "edward jenner and the history of smallpox and vaccination.” smallpox was introduced to europe sometime between the fifth and seventh centuries and was frequently epidemic during the middle ages. the disease greatly affected the development of western civilization. the first stages of the decline of the roman empire (ad 108) coincided with a large-scale epidemic: the plague of antonine, which accounted for the deaths of almost 7 million people. the arab expansion, the crusades, and the discovery of the west indies all contributed to the spread of the disease. unknown in the new world, smallpox was introduced by the spanish and portuguese conquistadors. the disease decimated the local population and was instrumental in the fall of the empires of the aztecs and the incas. similarly, on the eastern coast of north america, the disease was introduced by the early settlers and led to a decline in the native population. before it reached the new world, smallpox played a role in