During a winds from the northwest sweep toward the persian gulf, often causing major sandstorms.
a. wadi
b. kavir
c. bab
d. shamal

The question is asking what is the name of the group of winds that cause sandstorms during the day, and the answer is the Shamal. It is a group of winds that blows over Iraq and the Persian gulf and it causes sandstorms during the day because it can be very violent, however, it calms down during the night and you get sudden temperature drops.

Gave a little freedom to blacks