(Refer to Figure 75.) You’ve been asked to fly your UA to inspect a bridge being built in the southernmost part of Gila Bend.
A) You need permission from the FAA to operate here. 
B) You don’t need permission from the FAA to fly below 400 ft. AGL 
C) You don’t need permission from the FAA to fly below 700 ft. AGL

The answer to this question is A.

Gila Bend is a city, where the small yellow tinted area indicates the populated portion of the city.
See how the bottommost part of the city sits in Class D controlled airspace?

You’d need permission to operate here.