To summarize, the union members are calling to strike, but a member disagrees on the grounds that the strike and fines would be too expensive.

Option (C) points out that his argument is vulnerable on the grounds that the union workers might gain more from the strike (wages, benefits, etc) than it would cost them. This is the correct answer, because it points out a major benefit that the member's cost/benefit analysis failed to consider, hurting their argument.

Option (A) points out that the strike might cost union workers even if fines aren't imposed. This is not a criticism of the union members point--it actually supports their argument, as it would mean they shouldn't strike. In addition, this point is already considered in the stimulus--the member mentions they have a strike fund, which would likely keep the strike from costing the union members.

This mistake is pretty common, actually--you picked the answer that supported rather than hurt their argument. In the future, I would recommend pre-phrasing in order to help you remember what you're looking for in the answer choices.

I hope that is helpful!

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