The word “those” in paragraph 2 refers to __________.
Giải thích
Chọn đáp án B
Those ở đây đề cập đến người mỹ (Americans) trong câu trước đó: The study reveals, for example, that one quarter of Americans say that they have no one to discuss important personal issues with, and that the number of close friends that American have has dropped from three to two.