Answer:
Kilograms
Step-by-step explanation:
According to the standard unit system, the metric units for different quantities are as follows:
For length the Standard unit is 'Meters' denoted by 'm'
For Mass the Standard unit is 'kilograms' denoted by 'kg'
For time the Standard unit is 'seconds' denoted by 's'
Hence, the correct answer Kilograms
