Add Do Not Use a Number Line Except as a Check

Multiple Choice

Add. Do not use a number line except as a check.
- $-\frac{2}{5}+\frac{1}{15}$

A) $\frac{7}{15}$
B) $\frac{1}{3}$
C) $-\frac{1}{3}$
D) $-\frac{7}{15}$