Which of the following is a derived unit in the metric system?

The chosen answer, meter per second, is indeed a derived unit in the metric system because it is defined based on the combination of other fundamental units. In this case, meter is the unit of length, and second is the unit of time. When you divide the distance (in meters) by time (in seconds), you obtain a measure of speed or velocity, expressed in meters per second (m/s). This illustrates how derived units can be created from basic units to describe more complex physical quantities.

In contrast, the meter, second, and kilogram are all base units in the International System of Units (SI). They each represent a fundamental dimension (length, time, and mass, respectively) and do not depend on any other units for their definition, which differentiates them from derived units like meters per second.