The value of $$\frac{3}{8}+\frac{1}{7}\times1\frac{3}{4}+(\frac{2}{3}\div\frac{3}{10}of\frac{4}{9})-(3\frac{1}{5}\div4\frac{1}{2}of)\times\frac{15}{8}$$ is:

A

$$5\frac{1}{2}$$

B

$$10\frac{1}{2}$$

C

$$10\frac{1}{4}$$

D

$$5\frac{3}{8}$$