Correct option is B
The correct antonym of the given word is
(b) Contract.
Annex: To add or attach, especially territory (जोड़ना, कब्जा करना)
Example: The country annexed the neighboring island after the war.
Contract: To reduce in size or pull back; also means to enter into a legal agreement (सिकुड़ना या अनुबंध करना)
Example: Metals contract when cooled.
Synonyms: seize, occupy, appropriate, add.
Antonyms: detach, contract, separate, release.
Meanings of all the other given options:
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(a) Protract: To prolong (खींचना)
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(c) Profuse: Abundant, excessive (प्रचुर मात्रा में)
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(d) Propose: To suggest (प्रस्ताव देना)