$$\lim_{x\to 0}\cosec x \left( \sqrt{2\cos^2 x+3\cos x} - \sqrt{\cos^2 x+\sin x+4} \right)$$ is:

A

0

B

$$\frac{1}{\sqrt{15}}$$

C

$$\frac{1}{2\sqrt{5}}$$

D

$$-\frac{1}{2\sqrt{5}}$$