What is the value of $$\frac{1}{7} \times \frac{1}{8} \div \frac{72}{51} \ of \ \left(\frac{1}{9} + \frac{1}{8}\right) + \left(\frac{63}{56} \times \frac{48}{72}\right)$$?

A

$$\frac{21}{56}$$

B

$$\frac{19}{56}$$

C

$$\frac{45}{56}$$

D

$$\frac{15}{56}$$