For this case, the first thing you should know is the meaning of the acronym S.I.
S.I .: International system
The unit for the mass of any object in the international system is:
m: [kilograms]
Therefore, the unit of measurement of the mass of a boulder is kilograms.
Answer:
the correct SI unit to use in measuring the mass of a boulder is:
C. kilograms
5 = 0.005
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The least common multiple is 3