Sentence Correction (SC) | Re: Already anxious after watching a horror movie, Michelle mistook the so

Already anxious after watching a horror movie, Michelle mistook the sound of a backfiring car as the blast of a gunshot.

Two important things to answer the question:

1. Ensure the answer correctly states the sound of a car for the sound of a blast of a gunshot, not with the car or anything else
2. Answer should be idiomatic -Mistook X For Y

A) the sound of a backfiring car as the blast of a gunshot.
B) a car as it was backfiring for the blast of a gunshot.
C) the sound of a backfiring car for the blast
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