The tense of a sentence denotes a time, whether it is the time now (present), time then (past) or the time to come (future). The verb of a sentence has most to do with the tense. In the given sentence, we need to fill in a word that determines the correct tense. It's given that "my brother-in-law" plays football in the same club as the speaker. This is a daily activity, the action of 'playing football' is not taking place right now, or in the past. From the options, 'plays' is in the simple present tense, referring to a habit or a regular activity, hence option D is correct. 'Is playing' is in the present continuous tense, when placed in the sentence it does not sound very natural, as the speaker is talking about a daily activity, the person isn't playing football as the speaker speaks, hence option A is incorrect. 'Played' is in the simple past tense, and does not fit in the sentence, it would sound more natural if 'used to' were added to it, referring to a routine in the past, hence option B is incorrect. 'Play' is in the simple present tense, but it's in the first person point of view, used by the speaker 'I play football', whereas 'plays' is for the third person 'brother-in-law', hence option C is incorrect.