Add Do Not Use a Number Line Except as a Check

Multiple Choice

Add. Do not use a number line except as a check.
- $$- \frac { 2 } { 9 } + \left( - \frac { 8 } { 9 } \right)$$

A) $\frac { 10 } { 9 }$
B) $- \frac { 2 } { 3 }$
C) $- \frac { 10 } { 9 }$
D) $\frac { 2 } { 3 }$