Choose A, B, C or D to indicate the most suitable response to complete the following exchange

Choose A, B, C or D to indicate the most suitable response to complete the following exchange.  

31. "_______ ."                                       -  "I have a terrible headache." 

A. What causes you?                                     B. What's the problem to you?   

C. What's the matter with you?                        D. What happens with you?                                       

32. "What a delicious cake!"   -  "_______ " 

A. Thanks. I'm glad that you like it.                  B. Really?        

C. I don't believe so.                                        D. You're welcome