What is the answer of  $$\frac{1}{6} + \frac{1}{12} + \frac{1}{20} + \frac{1}{30} + \frac{1}{42} + \frac{1}{56}$$ ?

A

$$\frac{11}{24}$$

B

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

C

$$\frac{7}{16}$$

D

$$\frac{13}{28}$$