Find the Midpoint of the Line Segment Joining the Points $( - 9 , - 15 )$

Multiple Choice

Find the midpoint of the line segment joining the points A and B.
-A = (7, 1) ; B = (-16, -16)

A) $( - 9 , - 15 )$
B) $\left( \frac { 23 } { 2 } , \frac { 17 } { 2 } \right)$
C) $\left( - \frac { 9 } { 2 } , - \frac { 15 } { 2 } \right)$
D) $( 9,15 )$