The value of $$\frac{4 \tan^2 30^\circ + \frac{1}{4} \sin^2 90^\circ +\frac{1}{8} \cot^2 60^\circ + \sin^2 30^\circ \cos^2 45^\circ}{\sin 60^\circ \cos 30^\circ - \cos 60^\circ \sin 30^\circ }$$ is:

A

$$1\frac{3}{4}$$

B

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

C

$$3\frac{1}{2}$$

D

4