What is the value of $$\frac{\left[\sin (y - z) + \sin (y + z) + 2 \sin y\right]}{\left[\sin (x - z) + \sin (x + z) + 2 \sin x\right]}$$?

A

$$\cos x \sin y$$

B

$$\frac{(\sin y)}{(\sin x)}$$

C

$$\sin z$$

D

$$\sin x \tan y$$