Question

Dr. Mario Jose Molina won the Nobel Prize in Chemistry for his work studying which problem?

a. the ozone layer***
b. deforestation
c. the El Nino effect
d. the greenhouse effect

Answer 1

A is correct!
Hope this helps.

Answer 2

A.
He was a co-recipient of the 1995 Nobel Prize in Chemistry for his role in elucidating the threat to the Earth's ozone layer of chlorofluorocarbon gases.