Remember that measuring length is a measure of distance. Let's check our answers for any pending measures of distance.
Kilogram.
Kilogram is a measure of mass (or weight). This can normally be used for example for the SI Unit symbol: Kg.
We can get rid of kilogram, since it does not measure distance.
Kilometer.
Kilometer is a measure of distance. This can normally be used for example by it's SI Unit symbol: KM.
Kilometer can be broken down by it's prefix.
Kilo = Thousand
Kilometer means 1,000 meters, which is a unit of distance/length.
Your answer is B.) Kilometer.
I hope this helps!
