Explanation:

- We know the ratio A : B = 12 : 17. Let's assume A = 12x and B = 17x.

- A is 20% more than C. So, A = 1.2C, or C = A / 1.2.

- B is 15% less than D. This means B = 0.85D, or D = B / 0.85.

- Replace A = 12x in C = A / 1.2, to get C = 12x / 1.2 = 10x.

- Similarly, replace B = 17x in D = B / 0.85, to get D = 17x / 0.85.

- Now, find the percentage of C with respect to D.

- The relation is: (C / D) * 100% = (10x / (17x / 0.85)) * 100%.

- Simplify this to get C as 50% of D.

So, the correct option is Option 2: 50%.

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