The option from the given answer choice that is a compound sentence is:
A compound sentence is a sentence that contains more than one independent clause and is linked together by a conjunction.
This is different from a simple sentence which has just one independent clause and has no need for a conjunction to link them together.
From the sentence in option A, we can see that a coordinating conjunction "and" is used to join the two independent clauses there so that the sentence would make more sense to a reader.
Therefore, the correct answer is option A
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