Why not D?

Hi @avif, Thanks for the question! So (D) isn’t going to tell us anything about how Shimada shouldn’t criticize McFeney. It gives us pretty irrelevant information by just telling us that he criticizes himself for his own tardiness. We have ~Criticize self —> ~Criticize others But we cannot conclude from that Criticize self —> Criticize others Since that is a mistaken negation. Hope this helps! Feel free to ask any other questions that you might have.

Thanks for the response. I don't understand what you are saying. If we combine the information that we have in the application with what we have in answer choice D than it makes sense. We know that S criticizes himself (answer choice D) and therefore if he doesn't also vow to stop also then he shouldn't criticize others. But if he would vow to stop then he would have both the sufficient conditions which would allow him to criticize others. What am I missing here?

The principle that we are trying to apply here is that you should not criticize if you fail two tests. D establishes that S passes one of the tests. If S passes the test, then the principle cannot be properly applied.