Correct option is C
The correct synonym of the given word is (c) intensify.
Aggravate: to make a bad situation worse.
Synonyms: worsen, exacerbate, compound,
intensify.
Antonyms: alleviate, mitigate, ease.
Meanings of all options:
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Influence: to have an effect on something.
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Illustrate: to explain or make something clear with examples or pictures.
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Intensify: to increase in degree or strength.
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Illuminate: to light up or make clear.