A. He bought her flowers and diamond rings, that made her fall in love with him.

B. He bought her flowers and diamond rings which made her fall in love with him.

C. He bought her flowers and diamond rings, which made her fall in love with him.

D. He bought her flowers and diamond rings, what made her fall in love with him.

Đáp án: C

Giải thích: Đại từ quan hệ Which thay thế cho mệnh đề trước dấu phẩy.

Dịch: Anh mua hoa và nhẫn kim cương cho cô, điều đó khiến cô yêu anh.