Question

Why are SI units helpful for describing objects? A. They are the standard used by scientists worldwide. B. They are more accurate. C. They do not measure quantity. D. They are more precise.

Answer 1

They are the standard system used by scientists worldwide, and
officially by almost all nations of the world. So if you describe a
measurement in terms of SI units, there's less chance that you'll
need to explain the measurement to anyone who reads it ...
most scientists and common people worldwide will understand
what your number means.