It's a very poorly written question that appears to intend B as the answer, and asks the reader to assume the A2 was in the FC (as the question makes no sense otherwise) and to assume that scrambling means A3 has not yet touched ball (and the answer choices otherwise make no sense). All of the other three answers are obviously wrong; so despite how crappy the question is, B is the "best answer"--the cop out for test writers.
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