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

A

$$\frac{47}{12}$$

B

$$\frac{37}{12}$$

C

$$\frac{43}{12}$$

D

$$\frac{25}{12}$$