Mayor Pollister always repays his contributors by passing the laws they desire. Since Mayor Pollister recently passed the city' s first clean air act, he must have had a contributor to repay. Which one of the following is an assumption on which the argument depends?
A: Mayor Pollister recently gained a great deal of support from a contributor.
B: Mayor Pollister would not have passed the law unless he was doing so for a contributor.
C: Mayor Pollister needed contributions to succeed in the election.
D: The city will be benefited by the passage of the clean air act.
Choose A, B, C or D as your solution.
B