Three containers having volumes in the ratio $1 : 2 : 3$ are filled with a mixture of milk and water. In the first container, the ratio of milk to water is $3 : 1$, in the second $3 : 2$, and in the third $7 : 3$. If all containers are emptied into a large drum, what is the ratio of milk to water in the drum?

Options:

• A: $27 : 13$
• B: $13 : 27$
• C: $25 : 14$
• D: $14 : 25$

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