Are x and y rational numbers?
I. x + yis a rational number
II. x y is a rational number

A

if the statement I alone is sufficient to answerthe question.

B

if the statement II alone is sufficient to answerthe question.

C

if both the statements I and II are sufficient to answerthe question but neither statements aloneis sufficient.

D

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