The correct answer is A. The student is associating two things together, Bob and the word "obnoxious." Therefore, when she comes into contact with either, she will be reminded of the other.
He might mean that he is better than what he seems to be.
Someone about to do a few chores on farm
The saying means what is considered good is in fact bad and what is considered bad is actually good.
an example could be you trust someone and they seem to be a good person but looks are deceiving and they turn out to be bad