IF a be a 2$$\times$$2 matrix such that $$A\begin{bmatrix} 7 & 8 \\ 5 & 6 \end{bmatrix} = \begin{bmatrix} 3 & -4 \\ 2 &  -3 \end{bmatrix}$$, then trace of A =

A

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

B

$$\frac{75}{2}$$

C

$$-\frac{1}{2}$$

D

$$-\frac{75}{2}$$