What is the measure of an angle 'Y'?

I) Angle $$X = 120^{\circ}$$
II) Straight lines PQ and RS are parallel

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.