For real numbers x and y what is the value of x + 2y?
I. x > 0, y > 0
II. $$x^2 + 4y^2 + 4xy = 0$$

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

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