Correct option is C
The correct synonym of the given word is
Lethal.
Toxic: Refers to something harmful, poisonous, or causing damage (हिंदी: विषैला या हानिकारक).
Example: The factory released toxic fumes into the atmosphere.
Lethal: Refers to something capable of causing death or great harm (हिंदी: घातक).
Example: This snake has a lethal bite.
Synonyms: poisonous, harmful, venomous, dangerous.
Antonyms: safe, harmless, benign.
Meanings of the given other options:
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Option (a) Laudatory: Expressing praise (हिंदी: प्रशंसात्मक)
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Option (b) Lanky: Tall and thin (हिंदी: दुबला-पतला)
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Option (d) Licit: Legal or lawful (हिंदी: वैध)