Simplify $$\left[\left(5\frac{1}{2}\right)^{2} - \left(2\frac{3}{4}\right)^{2}\right] \div 2\frac{3}{4}$$.

A

$$8\frac{1}{4}$$

B

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

C

$$8\frac{3}{4}$$

D

$$2\frac{3}{4}$$