Simplify $$\cfrac{1 - \cfrac{3}{7} \div \cfrac{9}{49} \times \cfrac{3}{14}}{1 + \cfrac{3}{5} \div \cfrac{1}{25} \times \cfrac{1}{30}}$$.

A

$$\cfrac{1}{7}$$

B

$$\cfrac{1}{6}$$

C

$$\cfrac{1}{3}$$

D

$$\cfrac{1}{5}$$