This question is about the correct use of the verb in a conditional sentence. The correct answer is 'had played' which is used in the past perfect tense to describe a condition that was not met in the past. Option B is incorrect because 'played' is in past simple tense and does not fit the conditional structure. Option C is incorrect because 'plays' is in present simple tense and is not appropriate for a past conditional sentence. Option D is incorrect because 'playing' is in present continuous tense and does not fit the conditional structure.