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Official Explanation

This sentence provides another example of the proper sequence of tenses in a slightly different format. If the two events had actually occurred (neither event did occur), the “paying attention” would have occurred prior to the “having to be told again.” Therefore, the earlier event must be in the past perfect tense (had paid). The if clause is known as a condition contrary to fact (in fact, they did not pay attention).

The correct answer is (C).
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