Two classmates ask you to spend a couple of hours them prepare for a chemistry test. chemistry is a subject that you know very well. according to social exchange theory, you would be most likely to them if:

You would be most likely to help them if "you know you would feel terribly guilty for refusing their request".

Social exchange theory refers to a social mental and sociological point of view that clarifies social change and soundness as a procedure of arranged trades between parties. Social exchange hypothesis places that human connections are framed by the utilization of a subjective money saving advantage investigation and the correlation of options. 

Ibelieve that the answer is (a).