1. Assume the volume of each glass is 1 liter for simplicity.

2. Calculate the amount of milk in each glass:

• First glass: $1/3$ full of milk → $1/3$ liter of milk.
• Second glass: $1/4$ full of milk → $1/4$ liter of milk.

3. Calculate the amount of water in each glass:

• First glass: $1 - 1/3 = 2/3$ liter of water.
• Second glass: $1 - 1/4 = 3/4$ liter of water.

4. Total amounts in the pot:

• Total milk: $1/3 + 1/4 = 7/12$ liters.
• Total water: $2/3 + 3/4 = 17/12$ liters.

5. Simplify the ratio of milk to water:

• Ratio = $7/12 : 17/12 = 7 : 17$.

Therefore, the ratio of milk to water in the pot is 7:17, corresponding to option A.