6399. The raucous shouts of the audience forced the management to call off the show.

✅ The correct answer is option C.
Unpleasant : causing discomfort, unhappiness, or revulsion; disagreeable.

Loud : producing or capable of producing much noise.

Harsh : unpleasantly rough or jarring to the senses.

Harmful : causing or likely to cause harm.

Raucous : making or constituting a disturbingly harsh and loud noise.

Synonym of Raucous is Harsh