Add Do Not Use a Number Line Except as a Check

Multiple Choice

Add. Do not use a number line except as a check.
- $-\frac{5}{9}+\left(-\frac{2}{9}\right)$

A) $\frac{1}{3}$
B) $-\frac{7}{9}$
C) $\frac{7}{9}$
D) $-\frac{1}{3}$