What is the value of $$\frac{x^3 + 8y^3 - z^3}{xyz}$$

I. $$x + 2y = z$$

II. $$x > y >  z$$ 

A

if the statement I alone is sufficient to answer the question.

B

if the statement II alone is sufficient to answerthe question.

C

if both the statements I and II are sufficient to answer the question but neither statement alone is sufficient.

D

if both the statements I and II together are not sufficient to answer the question and additional data is required.