ECONOMICS: Economists make assumptions in order to a. Minimize the likelihood that some aspect of the problem at hand is being overlooked.
b. Focus their thinking on the essence of the problem at hand.
c. Minimize the number of experiments that yield no useful data.
d. Mimic the methodologies employed by other scientists.

I think that it might be B, but if someone could please double-check. No fake answers. Thanks in advance! :)