Correct option is A
The correct synonym of the given word is (a)
Evil.
Malign: To speak harmful untruths about someone; to slander or defame. (बदनाम करना / बुराई करना)
Example: He maligned his rival in front of the board to gain promotion.
Evil: Wicked or morally bad; harmful in effect. (दुष्ट / बुरा)
Example: The story was about the battle between good and evil.
Synonyms: slander, defame, vilify, disparage
Antonyms: praise, commend, applaud, extol
Meanings of all the other given options:
·
Radical: Fundamental or revolutionary in nature (मूलभूत / उग्र)
·
Nihilistic: Belief that life is meaningless (नास्तिक / अस्वीकारी)
·
Insurgent: A rebel or revolutionary (विद्रोही / बाग़ी)