What is the value of $$y$$?
(I) $$x = 2y + z$$.
(II) $$x = (y - 1)^{3}$$ and $$x = 8$$.

A

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

B

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

C

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

D

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