In sana'a, yemen, farming of the qat plant has caused farmers to a. overuse the city's water supply b. contribute to widespread fires c. create smog and air pollution d. create a massive urban heat island

The correct option is A.
Qat plant is a narcotic plant, whose cultivation requires huge amount of water. Most people in Yemen are addicted to this plant and they are engaged in its cultivation. This has drastically reduced the amount of water that is available in that country. 

D

Assuming this is a question on a test just name a restaurant by your house and the state you live in, its not too difficult : )