Final answer:
1 kilogram is equal to 1,000,000 milligrams. Option C is correct.
Step-by-step explanation:
One kilogram is equivalent to one million milligrams. This conversion involves moving from a larger unit (kilogram) to a smaller unit (milligram) within the metric system. The prefix "kilo-" denotes a factor of 1,000, and "milli-" signifies a factor of 0.001. Therefore, when converting from kilograms to milligrams, you multiply by 1,000 (to go from kilogram to gram) and then by another 1,000 (to go from gram to milligram), resulting in a multiplication by 1,000,000 in total. This process applies the principles of metric system conversions, where each step involves a factor of 10 raised to a power according to the specific prefixes involved.
Correct answer: c. 1,000,000