If 'x' , 'y' are positive integers, is $$\sqrt{x^{2} + y^{2}}$$ an integer?
I) $$x : y = 1 : 2$$
II) $$x + y$$ is an multiple of 7

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 the statements I and II together 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.