Solve the following equation.
$$\theta : 2 \cos^2 \theta + (4 + \sqrt{3})\sin \theta - 2(1 + \sqrt{3}) = 0$$ where $$\theta$$ is an acute angle.

A

$$30^\circ$$

B

$$45^\circ$$

C

$$15^\circ$$

D

$$60^\circ$$