May someone please help me? Which sentence correctly uses an appositive phrase?
A. The walk to school, a strenuous climb, left us very tired.

B. Walking to school, we quickly found ourselves exhausted.

C. The walk to school was uphill all the way.

D. Walking to school is a good way, for students, to excersise.​

Choice A

Explanation:

"A strenuous climb" renames the walk to school, which is being treated as the subject of the sentence.

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