Find the value of $$\sin^4 30^\circ + \cos^4 30^\circ - \sin 25^\circ \cos 65^\circ - \sin 65^\circ \cos 25^\circ$$

A

$$-\frac{3}{8}$$

B

0

C

$$\frac{5}{8}$$

D

$$\frac{13}{8}$$