Asking a multiple choice question without providing the choices doesn't really seem fair.
The metric system.
Metric measurement is measurement made using units as defined under the metric system.
a system of measurement.
metric system
It's called the metric system.
What metric unit would you use to measure a computer keyboard
The metric system is mostly a decimal system of measurement.
Metric system
Metric is an adjective and refers to a system of measurement.
All of the above except the yard. Yards are an Imperial measurement, not metric.
The metric system is accepted as the dominate measurement system in the world.
The metric system.