To convert gallons to milliliters, we first need to know how many quarts are in a gallon. We know that:
1 gallon = 4 quarts
Since we also know that:
1 quart = 946.35 milliliters
We can find out how many milliliters are in 1 gallon by multiplying the number of quarts by the number of milliliters in a quart:
\[ 1 \text{ gallon} = 4 \text{ quarts} \times 946.35 \text{ mL/quart} = 3785.4 \text{ mL} \]
Thus, there are 3785.4 mL in 1 gallon.
The correct response is: 3785.4 mL