Final answer:
The SI unit system is also known as the MKS (meters, kilograms, seconds) system, which is based on the metric system and uses the meter, kilogram, and second as base units.
Step-by-step explanation:
The SI unit system, used by scientists worldwide, is also known as the International System of Units. It is based on the metric system, which allows for easy conversion of units by factors of 10. The SI base units relevant to this question include the meter (m) for length, kilogram (kg) for mass, and second (s) for time. Therefore, the other name for the SI unit system among the given options is B) The MKS (meters, kilograms, seconds) system. Option C) The CGS (centimeters, grams, seconds) system refers to a different set of metric units, and D) The Imperial system is a non-metric system of units primarily used in the United States.