Which modifier is misplaced in the sentence? while competing in the race, a large rock that was sitting on the track caused maura to trip and stumble a few steps.

This sentence is basically saying that the large rock was competing in the race. In order for this not to happen, one could say, 'As Maura was competing in the race, a large rock that was sitting on the track caused her to trip and stumble a few steps.'
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its the first phrase "while competing in the race"

Explanation:

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