Which of the following represents a liter in metric measurement?

A liter is a unit of volume in the metric system, and it is commonly represented by the lowercase letter "l" (or sometimes "L"). The metric system uses a set of standard units based on powers of ten, making it easier to convert between units.

In this context, "m" stands for meters, which is a unit of length, "g" represents grams, a unit of mass, and "lb" denotes pounds, a unit of weight commonly used in the imperial system. Therefore, the only option that correctly represents a liter is "l." Understanding these definitions helps in accurately measuring and converting quantities in various scientific and medical calculations.