Which of the following is equivalent to one gallon?

One gallon is equivalent to 4 quarts. This is a standard conversion in the United States customary system of measurements. Understanding this conversion is important because it enables healthcare professionals to accurately measure and convert liquid volumes, which is crucial for administering medications and fluids correctly.

In a gallon, there are exactly four quarts, so choosing that answer reflects an understanding of liquid capacity measurements. Quarts, pints, and gallons all belong to the same system of measurement, making this conversion straightforward for practical applications in settings such as healthcare, cooking, and general measurements.

The other options do not represent the correct conversion for a gallon. For example, while the liter is a metric measurement, 1 gallon is approximately equal to 3.785 liters, not 2 liters or 1.5 liters. The option stating 8 pints is also relevant since 1 gallon equals 8 pints. However, only one of the choices accurately represents the direct conversion of a gallon to another measurement in a clear and uncomplicated way.