<p>How about "provid[ing] helpful hints" as suggested by @csgillespie and follow @whuber's suggestion on <a href="https://stats.meta.stackexchange.com/q/12/930">one of the thread</a> @Procrastinator referenced in his comment: "How can we use homework questions to the benefit of this community?"</p>

<p>For this question, in particular, I would have sketched briefly the distinction between continuous and discrete outcomes, with a particular emphasis on the Binomial and Poisson law and, maybe, how they relate one to the other. The OP also favored one of the option, and ruled out option D; we could rely on this and propose further discussion on probability distributions. This is what you did here and there in your post, but your third sentence already suggested a solution which leaves little room to arouse curiosity and thinking on the side of the OP.</p>

<p>In any case, I believe we should not feel embarrassed by how a question is formatted (many HW questions could easily be recasted as MCQ, IMO), and follow usual advice to answer homework questions, as suggested in the comments.</p>
