Você precisa transformar as frases afirmativas em negativas e interrogativas usando "can". Vamos analisar as alternativas para ver qual está correta: a) My brother can go to bed late. - Negativa: My brother can't go to bed late. - Interrogativa: Can my brother go to bed late? b) Karen can take the subway to go to the mall. - Negativa: Karen can't take the subway to go to the mall. - Interrogativa: Can Karen take the subway to go to the mall? c) They can close the store early on Friday. - Negativa: They can't close the store early on Friday. - Interrogativa: Can they close the store early on Friday? d) He can clean the bedrooms tomorrow. - Negativa: He can't clean the bedrooms tomorrow. - Interrogativa: Can he clean the bedrooms tomorrow? e) You can buy donuts for the children at the snack bar. - Negativa: You can't buy donuts for the children at the snack bar. - Interrogativa: Can you buy donuts for the children at the snack bar? Como o exemplo dado no enunciado é "They can help me after class." e a transformação é "They can't help me after class." e "Can they help me after class?", a alternativa que segue o mesmo padrão é a letra c) "They can close the store early on Friday." Portanto, a resposta correta é: c) They can close the store early on Friday.