The value of
$$ (5\div2 of \frac{1}{2})+(5\frac{1}{4}\div\frac{3}{7}of\frac{1}{2})\div(5\frac{1}{9}-7\frac{7}{8}\div9\frac{9}{20}) \times\frac{11}{12}$$ is :

A

$$\frac{35}{24}$$

B

8

C

$$\frac{15}{28}$$

D

-2