I'll give you a question, please answer with step-by-step reasoning process.
If I want to behave with proper aplomb, what manners should I avoid?\nOptions:\n- inappropriate\n- incomplete\n- impolite\n- none\n- incorrect

inappropriate
All the inappropriate manners should be avoided to behave properly.

To act with proper aplomb, you need to get rid of all inappropriate and bad manners.

.

So, the answer is inappropriate