Correct option is C
The correct synonym of the given word is (c)
fatal.
Deadly: Something that can cause death or extreme harm. (घातक, जानलेवा)
Example: He consumed a deadly poison.
Fatal: Leading to death; causing ruin or disaster. (प्राणघातक)
Example: The injury turned out to be fatal.
Synonyms: lethal, mortal, terminal, dangerous
Antonyms: harmless, safe, secure, healing
Meanings of all the other given options:
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(a) Vital: Essential; necessary for life (अनिवार्य)
·
(b) Deaden: To make less intense or dull (कम करना)
·
(d) Explicit: Clearly expressed or stated (स्पष्ट)