What is used to measure mass?

The correct choice, which is gram, is a unit of measurement specifically used to quantify mass. Mass refers to the amount of matter in an object, and the gram is part of the metric system, widely utilized for scientific and everyday measurements. This unit allows for precise and understandable measurement, particularly in contexts such as cooking, laboratory work, and various fields of science and engineering.

The other choices represent different units of measurement not associated with mass. For instance, a liter measures volume, specifying how much space a substance occupies. A meter is a unit of length, which characterizes the distance between two points. Lastly, a foot measures length in the imperial system, often used in the United States and other countries for everyday measurements of distance. Understanding these distinctions helps solidify the role of the gram as the appropriate measurement for mass.