C. asked about a missing question mark

Thanks for your useful question, that will also help other users with these specific questions.

Here we chose not to put any punctuation mark at the end of the statement not to give it away too easily.

​However, the specific order of the words can only be used in a question. If it were a command, there'd be no 'vous'.

​You also probably noticed that all four answers have punctuation marks, but this question is specifically about the word ordering.

I hope that's helpful!
À bientôt !