Question

Air pollution is caused by  A. the sun.  B. heavy rainfall.  C. natural events and human activities.  D. human activities but not natural events.

Answer 1

It's a tie for me between C. and D. but I am going to say D. I hope this is the right answer for you.

Answer 2

I would say your answer is D) human activities but not natural events.

because we cause it by burning coal, gases from our cars, or harming the enviroment it isnt caused by rainfall or sun.

sorry if im wrong