The correct answer is: They were playing a football match in the evening. What were you doing?
The verb “were playing” is in the past continuous tense, which is used to describe an action that was happening at a specific time in the past. In this case, the time is specified as “in the evening.” The verb “doing” is in the present tense, which is used to describe an action that is happening now. In this case, the action is not happening now, so the present tense is not appropriate.
The verb “played” is in the simple past tense, which is used to describe an action that happened at a specific time in the past. In this case, the time is not specified, so the simple past tense is not appropriate.
The verb “have played” is in the present perfect tense, which is used to describe an action that happened at some point in the past and has an effect on the present. In this case, the action does not have an effect on the present, so the present perfect tense is not appropriate.
The verb “will” is in the future tense, which is used to describe an action that will happen in the future. In this case, the action is happening now, so the future tense is not appropriate.
Therefore, the correct answer is: They were playing a football match in the evening. What were you doing?