Iwill mark you as brainlinest for correct

True; with improvements in technology/manufacturing, acid rain became a major problem

The answer is true it did become major transboundary. 

El nino is a weather phenomenon caused when warm water from the western pacific ocean flows eastward. part1baan average of 7.7 hurricanes and 3.6 major hurricanes compares to 5 hurricanes and 1.5 major hurricanes from 1995-2005

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )