Which of the following limiting factors would be directly affected by a drought?
a. birth/death rate
b. immigration
c. available niche
d. resource supply

Obviously, out of the choices above, resource supply would be directly affected by a drought. Drought happens when there is a little rain (or no rain at all) in a long span of time. Thus, agricultural sources of food (and other products which needs rain) would be greatly affected.

can you tell me where are the ansawer choices

okay what's the question?