Correct option is B
The correct antonym of the given word is (b) broad.
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Narrow: It means
having a small width, not wide or broad (संकीर्ण, तंग).
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Example: The narrow bridge allowed only one vehicle at a time.
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Broad: It means
having a wide extent from side to side, opposite of narrow (चौड़ा, विस्तृत).
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Example: The broad highway made the journey much smoother.
Synonyms: confined, tight, limited, cramped.
Antonyms: broad, wide, expansive, open.
Meanings of other options:
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Mild: Not harsh or strong (हल्का, सौम्य).
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Slender: Thin and delicate in form (पतला, कोमल).
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Straight: Not curved or bent (सीधा, समतल).