Answer:
Your answer would be A.
Step-by-step explanation:
The revision that corrects the run-on sentence is sentence A. A run-on sentence occurs when two independent clauses are not joined correctly. There are two types of run-on sentences: fused sentences and comma splices. The first ones occur when two independent clauses run together with no marks of punctuation or coordinating conjuctions to separate them, while the second ones occur when two independent clauses are joined only by a comma. The sentence above is therefore a comma splice.
You should use a semicolon to link in a single sentence two independent clauses that are closely related in thought. What is more, when you use a semicolon to bring together two ideas in a sentence, you are giving them equal rank or position. All in all, that is why A is the right choice.