A metric system measures the object in different units to estimate the mass, length, capacity, etc. The kilogram is the unit used as a standard to measure the mass. Thus option C is correct.
What is the standard unit system?
The standard unit system (SI) in the metric system is a system that measures the length, mass, and capacity in units of meters, kilograms, and liters.
The mass is the weight and is measured by kilograms (kg) in the SI unit. The other units meter and liter are the SI units of length and capacity, respectively.
Therefore, the SI unit of mass is the kilogram.
Learn more about the metric unit system here:
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