Explanation:

- A, B, and C together can complete the work in 10 days, meaning their combined work rate is 1/10 of the work per day.

- A and B together can complete the same work in 12 days, indicating their combined work rate is 1/12 of the work per day.

- To find C's work rate, we subtract A and B's combined rate from A, B, and C's combined rate: $\frac{1}{10}-\frac{1}{12}=\frac{1}{60}$.

- C alone can do the work in 60 days, making their share of the work $\frac{1}{60}$ out of $\frac{1}{10}$.

- C’s contribution is one-sixth of the total work.

- Therefore, C's share of Rs 9,000 is $\frac{9000}{6}=$ Rs 1,500.

Correct Answer: Option 3 - Rs 1,500