A：I prefer western food.It's a kind of healthy food.B：？But western food is said to be high

问题补充：

A：I prefer western food.Its a kind of healthy food.

B：？But western food is said to be high in sugar and fat.

A. Is that right

B. How do you know that

C. Do you really think so

D. Who told you that

答案：

A. Is that right

B. How do you know that

(答案→)C. Do you really think so

D. Who told you that

解析：

答话人对前者的观点提出质疑，并提出自己的观点。Do you really think so？你真得这样认为吗？故选C。