Answer:
A. A storm might have come. It wants the sentence that states the POSSIBILITY not a sentence that says for sure that there was a storm in the past. Might means that there is/was/will be a possibility.
The sentence that indicates the possibility of a storm in the past is C. A storm came
When a thing is said to have happened in the past, it means that that event has already happened.
As a result of this, when a storm is said to have alaready happened, then that event is in the past and can be put in a sentence loke, "A storm came"
Therefore, the correct answer is option C
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