The correct answer is Hacen
Explanation:
In the Spanish language, the conjugation of a verb varies depending on the subject and the tense; although, there are general patterns in conjugations. In the case of regular verbs in present, the conjugation for the pronoun "I" ends in "o"; the one for the pronoun "you" ends in "os"; the one for "she or he" ends in "a" or "e", and the one for the pronoun "they" ends in "vowel + n."
In the sentence "Juan y Carlos la tarea en la noche" (Juan and Carlos do the homework at night" the subject is "Juan and Carlos" and this can be replaced by "they". In this context, the conjugated verb should end in "vowel + n", and therefore the correct option is "hacen".
