Answer:
B.
Explanation:
A and C have awkward sentence structure because "when a car needs many serious repairs, it might be cheaper to buy a new car", it repeats the word car again making it redundant and in C, "When a car had needed many serious repairs, it might be cheaper to buy a new one", it has wrong use of past-tense.
Revision involves clarifying purpose and meaning.
All other choices would be incorrect because they are a part of the process of editing.
Answer: Six lines rhymed in various ways.
Explanation: :)