.
What is the sum which earned interest?

I.

The total simple interest was Rs. 7000 after 7 years.

II.

The total of sum and simple interest was double of the sum after 5 years.

A. I alone sufficient while II alone not sufficient to answer
B. II alone sufficient while I alone not sufficient to answer
C. Either I or II alone sufficient to answer
D. Both I and II are not sufficient to answer
E. Both I and II are necessary to answer