The answer to your question is ¿Quién cometió el crimen?
Explanation:
¿Quién comete el crimen? This is not the right answer because the verb "cometer" is conjugated in the third person in present simple, it doesn't flts in the sentence.
¿Quién cometió el crimen? This is the right answer because all the parts of the sentence are right.
¿Quién cometiste el crimen? This answer is wrong because the verb cometer is not right conjugated, it's conjugated in the second person in present and must be conjugated in past.
¿Quién comió el crimen? This option is wrong because the verb "comer" can not be used in this sentence. Crimes are not eatable.
