6536. He had a strange quirk of hitting his sister every now and then.

✅ The correct answer is option C.
Fondness : affection or liking for someone or something.

Aversion : a strong dislike or disinclination.

Habit : a settled or regular tendency or practice, especially one that is hard to give up.

Diversion : the action of turning something aside from its course.

Quirk : a peculiar aspect of a person’s character or behaviour.

Synonym of Quirk is Habit