Correct option is D
The correct synonym of the given word is (d)
Reasonable.
Justifiable: Capable of being shown to be right or reasonable; defensible with logic or evidence. (सही ठहराने योग्य, न्यायसंगत)
Example: His anger was justifiable given the unfair treatment he received.
Reasonable: Fair, logical, and showing sound judgment; able to be justified. (उचित, विवेकपूर्ण)
Example: It is reasonable to expect good service at a reputed restaurant.
Synonyms: logical, defensible, fair, valid
Antonyms: unjustifiable, indefensible, irrational, unfair
Meanings of all the other given options:
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(a) Indefensible: not justifiable by argument (अविवेचनीय)
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(b) Neutral: not taking sides (निष्पक्ष)
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(c) Maintainable: capable of being maintained (संभालने योग्य)