I think it's C. Reaction Formation
Explanation:
It purposefully mentions how Mr. Gomez is going through something emotionally bearing like a divorce, hence why his own focus and normal punctuality declined.
Reaction Formation is the psychological mechanism/tendency of a repressed wish or feeling to be expressed at a conscious level in a contrasting form... Which Mr. Gomez showed towards the students and his own job. This is why this answer makes the most sense.
A) Displacement and D) Projection are definitely not it. Regression is a psychological mechanism that has to do with earlier stages of development and abandoned forms of gratification belonging to them, so that's not the answer either.