A gallon is equivalent to how many liters?

The correct answer is based on the understanding of unit conversions between gallons and liters. Specifically, one U.S. gallon is equivalent to approximately 3.78541 liters. When rounding this value, it is most commonly simplified to about 3.8 liters in practice. This conversion is important in various fields, such as cooking and science, where precise measurements are crucial. Therefore, selecting 3.8 liters aligns with the established metric conversion, making it the appropriate choice in this context.