Correct option is D
The correct one-word for the given group of words is
Contentious.
Contentious refers to someone who is argumentative or prone to disputes (हिंदी: झगड़ालू).
Example: The contentious lawyer was known for his heated debates in court.
Meanings of the given other options:
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Option (a) Reticent: Reserved or unwilling to express thoughts (हिंदी: चुप रहने वाला)
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Option (b) Coward: A person who lacks courage (हिंदी: कायर)
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Option (c) Veracious: Truthful or honest (हिंदी: सत्यवादी)