Correct option is A
The correct one-word for the given group of words is (a) Soliloquist.
Explanation: A
soliloquist is a person who talks to themselves, especially in a drama or introspective monologue.
(Hindi meaning: आत्मभाषण करने वाला व्यक्ति)
Example: Hamlet is famous for being a soliloquist in Shakespeare’s play.
Meanings of other options:
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(b) Ventriloquist: One who speaks without moving lips and makes it seem a puppet is speaking (कठपुतली के माध्यम से बोलने वाला)
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(c) Colloquist: No valid usage in standard English – distractor
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(d) Somniloquist: One who talks while asleep (नींद में बोलने वाला)