Question

-Lucy, this is Mr Smith, my uncle.-How do you do, Lucy?  

-________

1. A.
   How do you do, Mr Smith? Good morning.
2. B.
   How are you, Mr Smith? Nice to see you.
3. C.
   How do you do, Mr Smith? Nice to see you.
4. D.
   How are you, Mr Smith? Good morning.

Answer 1

C
“How do you do？”的应答为“How do you do?”.