The value of $$5\frac{1}{4}+\frac{1}{4}\div\frac{1}{4}of\frac{1}{8}-\frac{9}{4}+1\frac{1}{3}\div1\frac{1}{4}of\left[2\frac{3}{5}-2\frac{1}{3}\right]$$ is:

A

12

B

10

C

15

D

5