He was the most disputatious student I ever had.

Answer: Option B

Scandalous : causing general public outrage by a perceived offence against morality or law.
Argumentative : given to arguing.
Uncertain : not able to be relied on; not known or definite.
Opinionated : characterized by conceited assertiveness and dogmatism.
Disputatious : fond of having heated arguments.

Synonym of Disputatious is Argumentative