The stimulus is basically saying that if it is sometimes okay to do
A and it is sometimes okay to do
B, then it must sometimes be okay to do both
A and
B at the same time.
This is flawed because combining these two actions may have a different effect from taking just one: perhaps asking for money is a little different when you have a weapon in your hand. As a side note, this is one of the funnier stimuli on the exam. The speaker here is trying to argue that extortion is sometimes okay
Answer choice (C) very closely matches up with the stimulus. Perhaps the only thing different is that this answer choice says "healthful" instead of a more analogous "not unhealthful." That is a minor change though. The speaker of answer choice (C) is still concluding that because it is sometimes okay to take medicine A and it is also sometimes okay to take medicine B, then it must be okay to take them together. This argument overlooks the possibility that taking the two medicines together may have a very different result. Serious drug interactions happen frequently.
Answer choice (A) does not try to prove that it is okay to combine two actions. Rather, this argument concludes something about what happens when an even is neither business nor social.
The inclusion of "or" in answer choice (A) was a tricky move. The stimulus did include the word "or," but it included it in a very different context. In the stimulus, the author is talking about one type of action when using or: asking for money or a favor. This is an example of the Shell Game at work.
