Take another look at the sentence:

The hike through the canyon exhausted Kim. The steep incline made her thigh muscles throb, __________, and the relentless sun burned her skin.

The blank requires a short main clause. You chose aching shoulders from the heavy pack, which is a noun phrase followed by a prepositional phrase. You thus have a parallelism error.

Before you continue, review the rules for parallel structure.

Go back to the sentence to try again.

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