By how many years is Aswani younger than her brother Sanjay?
I. The ratio of Aswani's present age to that of Sanjay after 3 years is 7:9
II. The ratio of Aswani sage three years ago to Sanjay's present age is 1:2

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 statement I and II alone 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.