The answer is B. Pint.
A tonne is a unit of mass equal to 1,000 kilograms. A gallon is a unit of volume equal to 4.54609 liters. A litre is a unit of volume equal to 0.001 cubic meters. A pint is a unit of volume equal to 0.568261784 liters.
Pints are not used in the metric system, which is the system of measurement used in most of the world. The metric system is based on the decimal system, which means that all units are related to each other by powers of 10. For example, 100 centimeters equals 1 meter, and 1000 meters equals 1 kilometer.
The imperial system, which is the system of measurement used in the United States and a few other countries, is not based on the decimal system. This makes it more difficult to convert between units in the imperial system. For example, 12 inches equals 1 foot, and 3 feet equals 1 yard.
The metric system is a more logical and consistent system of measurement than the imperial system. This is why most of the world uses the metric system.