The value of $$\frac{\frac{3}{7}\div\frac{3}{7}\times\frac{3}{7}}{\frac{3}{7}\div\frac{3}{7} of \frac{3}{7}} - \frac{9}{49}$$ is:

A

$$\frac{40}{49}$$

B

0

C

1

D

$$\frac{9}{49}$$