--How are you?A. How are you?B. How do you do?C. Fine thanksD. He is fine．

问题补充：

--How are you? --

A. How are you?

B. How do you do?

C. Fine，thanks．

D. He is fine．

答案：

A. How are you?

B. How do you do?

(答案→)C. Fine，thanks．

D. He is fine．

解析：情景交际。How are you? 你好吗；How do you do?一向可好；Fine，thanks．很好，谢谢你；He is fine．他很好。根据上文，你好吗？可知选C。