What is the two digit number ?
I. The difference between the two digits is 9.
II. The sum of the digits is equal to the difference between the two digits.

Give answer (A) if the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question.

Give answer (B) if the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question.

Give answer (C) if the data either in statement I alone or in statement II alone are sufficient to answer the question.

Give answer (D) if the data even in both statements I and II together are not sufficient to answer the question

Give answer (E) if the data even in both statement I and II together are necessary to answer the question.