Solve the Problem $( - 2,1 )$ And $( 1 , - 3 )$

Solve the problem.
-A map of a hiking area is drawn so that the Visitor Center is at the origin of a rectangular grid. Two hikers are located at positions $( - 2,1 )$ and $( 1 , - 3 )$ with respect to the Visitor Center where all units are miles. A campground is located exactly halfway between the hikers. What are the coordinates of the campground?

A) $\left( - \frac { 1 } { 2 } , 2 \right)$
B) $\left( - \frac { 1 } { 2 } , - 1 \right)$
C) $\left( - \frac { 3 } { 2 } , - 1 \right)$
D) $\left( - \frac { 3 } { 2 } , 2 \right)$