What is the rate of interest p.c.p.a.? I. An amount doubles itself in 5 years on simple interest. II. Difference between the compound interest and the simple interest earned on a certain amount in 2 years is Rs. 400. III. Simple interest earned per annum is Rs. 2000.

1. A Option A: I only
2. B Option B: II and III only
3. C Option C: All I, II and III
4. D Option D: Any two of the three
5. E Option E: I only or II and III only

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