Correct option is D
The correct one-word for the given group of words
"An underground hole dug by a small animal as a dwelling" is
burrow.
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Burrow refers to a hole or tunnel dug by small animals, such as rabbits or moles, as a home or refuge. (बिल)
· Example: The rabbit quickly disappeared into its burrow to escape the predator.
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Meanings of the given other options:
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drain: A channel or pipe for carrying off water or other liquids.
·
pit: A large hole in the ground.
·
cave: A large underground chamber, typically of natural origin, in a hillside or cliff.