Provide an Appropriate Response $7 , x , 5$ To Be an Arithmetic Sequence

Multiple Choice

Provide an appropriate response.
-For $7 , x , 5$ to be an arithmetic sequence, $x$ must be:

A) 6

B) $\frac { 19 } { 3 }$

C) $\frac { 17 } { 3 }$

D) 1