By selling a product with 20% profit, how much profit was earned? I. The difference between cost and selling price is Rs. 40. II. The selling price is 120 percent of the cost price.

1. A Option A: I alone sufficient while II alone not sufficient to answer
2. B Option B: II alone sufficient while I alone not sufficient to answer
3. C Option C: Either I or II alone sufficient to answer
4. D Option D: Both I and II are not sufficient to answer
5. E Option E: Both I and II are necessary to answer

How we write and check questions