CACOPHONOUS:

Loud
Melodious
Sonorous
Harsh

The correct answer is D. Harsh.

Cacophonous is an adjective that means harsh, discordant, or unpleasant to the ear. It is derived from the Greek word kakos, meaning “bad,” and phone, meaning “sound.”

A loud sound is one that is high in volume. A melodious sound is one that is pleasing to the ear, often because it is harmonious or rhythmic. A sonorous sound is one that is deep and full-bodied.

In contrast, a harsh sound is one that is unpleasant to the ear, often because it is loud, discordant, or grating.