Metric system is one of the systems that are used to measure the physical quantities.
Metric measurements composed of both metric prefix and a basic unit of a measurement.
For example length of a bride is 2 km. Here, the k represents metric prefix kilo and ‘m’ represents the unit of measurement meter.
Hence, the options B, C, and D are wrong.
All metric measurements are composed by metric prefix and the unit of measurement.
Hence, the correct option is .