Add Do Not Use a Number Line Except as a Check

Multiple Choice

Add. Do not use a number line except as a check.
- $- \frac { 1 } { 8 } + \left( - \frac { 5 } { 8 } \right)$

A) $- \frac { 1 } { 2 }$
B) $\frac { 3 } { 4 }$
C) $\frac { 1 } { 2 }$
D) $- \frac { 3 } { 4 }$