If C1 and C2 are the circumferences of the outer and inner

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Direction: Each o the following questions is followed by two statements. Mark

If C1 and C2 are the circumferences of the outer and inner circles respectively. What is C1 : C2?
I. The two circles are concentric.
II. The area of the ring is 2/3 the area of greater circle.

1. if statement I alone is sufficient to answer the question.
2. if statement II alone is sufficient to answer the question.
3. if both statement I and II together are necessary to answer the question.
4. if both statement I and II together are not sufficient to answer the question.

Correct Option: B

If we look at Statement I
It is given that the circle are concentric. But nothing is given about their dimensions. Hence I alone is not sufficient.
In statement II ratio of area is given hence we can find the required ratio.