The value of $$3 \times 8 \div 4 of 6- 6 \div 4 \times \left(13 - 15\right) + 4 - 2 \times 9 \div 6 \times 6$$ is:

A

$$8\frac{1}{2}$$

B

-16

C

$$7\frac{1}{2}$$

D

-10