Need help on this multiple choice question, thanks!

Microscopic airborne particulates that reflect incoming solar radiation and thereby tend to cool the atmosphere are called:

a. CFCs
b. aerosols
c. greenhouse gases
d. indoor air pollutants
e. hazardous air pollutants

Thanks again!

2 answers

http://en.wikipedia.org/wiki/Aerosol
Thanks Dr. Bob, appreciate it!