Although C is consistent with the current flow, it does not reflect what you stated an electron beam is fired at the circular object.Why is it that I can never get anyone from the "electron current" crowd to answer a question like this. It should be easy.
Let's make it one step easier.
From an electron current perspective, which of the following properly describes the physical movement of charge when an electron beam is fired at the circular object shown?
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This is not some trick question. If I were to ask this of anyone from the "conventional current" and ask which is the proper depiction from that perspective, they would say that (b) and (c) are equivalent and either is accurate. According to the E-book and nearly every other source that favors electron current as depicting the "true" current, they would say that the answer is (a). Do you agree?