The answer is "D"We are comparing the condition of the air before and after the thunderstorm,So there are 2 situations involved which demands a comparative form of the adjective. Also, as humid is a disyllable ,"more" is necessary to form the comparative, You can't say' humider '
There's no answer choices, but a simile would be comparing two different things using "like" or "as". So if one of the answer choices has one of those words it's probably your answer.
Answer:
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