In order to answer the question, we must first turn to the types of consumers. Presumably, most parents (47)________are always worrying about their children's safety buy mobile phones for them to track their whereabouts. We can also assume that most teenagers want mobile phones to avoid missing out on social contact.

Chọn D.

Kiến thức về mệnh đề quan hệ

* “parents” là danh từ chỉ người => chọn “who” vì “who +V”; whom + S + V

Thông tin: In order to answer the question, we must first turn to the types of consumers. Presumably, most parents who are always worrying about their children's safety buy mobile phones for them to track their whereabouts.