Fill in the blank with the most suitable Preposition :

The parents were clamouring ______ the negligence of the school.

against

The correct answer is Option (3) → against

"The parents were clamouring against the negligence of the school."

In this context, "against" indicates opposition or protest towards the negligence of the school. It implies that the parents are expressing their dissatisfaction and disapproval regarding the school's negligence.