PLEASE HELP

PLEASE HELP

Sara and Sam are each working on a science project in which they need to research the individual masses of the nine planets (including the dwarf planet Pluto as the ninth planet). Sara completes her data for the planets' masses in kilograms while Sam's data is in milligrams.
Sara:

Approximate how many times greater Saturn's mass is than Mercury's.

A: 2,000,000

B: 200,000

C: 20,000

D: 2,000