Question

which unit of measure is the correct si unit to use in measuring the mass of a boulder? ○ ounces ○ pounds ○ kilograms ○ tons

Explanation:

The SI (International System of Units) unit for mass is the kilogram. Ounces and pounds are imperial units, and tons (while sometimes used for mass) is not the base SI unit for mass. The base SI unit for mass is the kilogram, so for measuring the mass of a boulder, kilograms is the correct SI unit among the options.

Answer:

C. kilograms