Provide an Appropriate Response $13 , x , 2$ To Be an Arithmetic Sequence

Multiple Choice

Provide an appropriate response.
-For $13 , x , 2$ to be an arithmetic sequence, $x$ must be:

A) $\frac { 11 } { 2 }$
B) $\frac { 15 } { 2 }$
C) $\frac { 28 } { 3 }$
D) $\frac { 17 } { 3 }$