An extremely deep crack or opening in the ground

A. Chasm

B. Aperture

C. Ditch

D. Pit

Answer: Option A

Solution(By Examveda Team)

One word substitute is Chasm.

Chasm: a deep fissure in the earth's surface.
Aperture: an opening, hole, or gap.
Ditch: a narrow channel dug at the side of a road or field, to hold or carry away water.
Pit: a coal mine.