Select the most appropriate word to fill in the blank.
He was dismissed for being combative and antagonistic ____________ his supervisor.

Correct option is D

The correct option to fill in the blank is (d) towards.
Explanation of correct answer: "Towards" is used to indicate direction or orientation and is appropriate here to describe the attitude or behavior directed at the supervisor.
Meanings of other options:
· About - In the context of; concerning.
· Above - At a higher level or layer.
· Through - Moving in one side and out of the other side of (an opening, channel, or location).