Find the Rational Number Halfway Between the Two Given Rational $- \frac { 5 } { 8 } , - \frac { 5 } { 16 }$

Multiple Choice

Find the rational number halfway between the two given rational numbers.
- $- \frac { 5 } { 8 } , - \frac { 5 } { 16 }$

A) $- \frac { 5 } { 18 }$
B) $- \frac { 5 } { 12 }$
C) $- \frac { 5 } { 32 }$
D) $- \frac { 15 } { 32 }$