$$5\frac{1}{5}-\left[ 3\frac{1}{2}-\left\{ \frac{5}{6}-\left( \frac{3}{5}+\frac{1}{10}-\frac{4}{15}\right)\right\}\right]$$ is equal to:

A

$$\frac{21}{10}$$

B

$$\frac{7}{5}$$

C

$$\frac{7}{3}$$

D

$$\frac{8}{3}$$