If $$A = \frac{1}{2} + \frac{1}{3} \times \frac{1}{4} \div \frac{1}{5} - \frac{1}{6}$$ and $$B = \frac{1}{2} \div \frac{1}{3} \times \frac{1}{4} + \frac{1}{5}$$, then what is the value of A - B?

A

$$\frac{17}{20}$$

B

$$\frac{9}{20}$$

C

$$\frac{7}{40}$$

D

$$\frac{1}{5}$$