A sad song:

A. Ditty

B. Knell

C. Dirge

D. Lay

Answer: Option C

Solution(By Examveda Team)

The one word substitution is Dirge.

Ditty: a short, simple song.
Knell: the sound of a bell, especially when rung solemnly for a death or funeral.
Lay: down gently or carefully.
Dirge: a mournful song, piece of music, or sound.