Task: Question Answering
Input (English): Question: A part of certain sum of money is invested at 9% per annum and the rest at 12% per annum, if the interest earned in each case for the same period is equal, then ratio of the sums invested is?

 Option A: 1:5

 Option B: 2:3

 Option C: 4:9

 Option D: 4:3

 Option E: 6:2
Output (English): Option D