Which of the following represents a decimal system of measurement?

1 quart = 16 fluid ounces

1 mile = 5,280 feet

1 kilometer = 1,000 meters

1 pound = 16 ounces

2 answers

In a decimal system, the various units are in ratios of powers of ten.

Which of those qualifies?
I think its 1 km = 1,000 meters