The value of $$8 - 4 \div of 3 + \left(7 \div 7 of \frac{1}{7}\right) \div 6 + \left(3 \times 6 \div \frac{1}{3}\right) \times \frac{1}{6}$$ is:

A

0

B

$$18\frac{2}{3}$$

C

$$12\frac{2}{3}$$

D

18