Solve the follwing.
$$\left[25^2 + 8 \div 2^3 - \left\{16 + \left(28 of 7 \div 2^2 \right) - \left(18^2 \div 12^2 of \frac{1}{8} \right)\right\}\right]$$

A

626

B

529

C

721

D

579