Which of the Following Is Not True of UV Exposure

Multiple Choice

Which of the following is not true of UV exposure?

A) UVA radiation accounts for about 95% of all UV radiation reaching the Earth's surface.
B) Only exposure to UVA is a concern,not exposure to UVB and UVC.
C) UV radiation is potentially harmful and individuals should take appropriate precautions depending on the UV index.
D) UV radiation varies spatially according to the season,local weather conditions,and overhead ozone depletion.
E) UVB alters plant physiology and can lead to decreased agricultural productivity.