He was the most disputatious student I ever had.

The correct answer is: B. argumentative.

A disputatious person is someone who likes to argue or debate. They are often opinionated and enjoy challenging others’ views. They may be seen as being difficult to get along with, but they can also be seen as being intelligent and insightful.

The other options are incorrect because:

• Scandalous means causing or likely to cause public outrage or disgrace.
• Uncertain means not sure or confident.
• Opinionated means having strong beliefs or opinions that are not easily changed.