Add and Simplify $\frac{2}{7}+\frac{4}{7}$ A) $\frac{5}{7}$ B) $\frac{5}{6}$ C) $\frac{6}{7}$ D) $\frac{7}{8}$

Add and simplify.
- $\frac{2}{7}+\frac{4}{7}$

A) $\frac{5}{7}$
B) $\frac{5}{6}$
C) $\frac{6}{7}$
D) $\frac{7}{8}$