C. Country
Step-by-step explanation:
None of the answers had an underlined part so I'm going to assume the underlined part is the same letters they all share. Those letters are ou.
A. surround B. counting C. country D. about
Surround = ow sound
Counting =ow sound
Country= uh sound
About=ow sound
As we can see Country is the only word with a different sound of the underlined part, therefore it is our answer.