Explanation:

- Let's consider the shares of A, B, and C as $\text{A's share}=7x$, $\text{B's share}=12x$, and $\text{C's share}=5y$.

- The ratio of B to C is 8:5, so $12x=8y$ or $y=\frac{3}{2}x$.

- Therefore, $\text{C's share}=5\times \frac{3}{2}x=\frac{15}{2}x$.

- Now, the difference between A and C is 219.

- Simplifying: $7x-\frac{15}{2}x=219$.

- Solving this gives $\frac{-1}{2}x=219$ or $x=438$.

- Total sum $\text{A + B + C}=7x+12x+\frac{15}{2}x=\frac{59}{2}x$.

- Substitute $x=438$ into the total sum to find $\text{Rs}x=12903$.

- This calculation suggests the correct total sum is not in the options provided.

- Hence, among the provided options, none of them directly match the calculated total.