Final answer:
Among the provided options, the unit of length in the metric system is the meter while feet, inches, and miles are units of length in the U.S. customary system.
Step-by-step explanation:
The unit of length in the metric system among the given options is the meter.
The metric system is an international system of measuring that is used by most countries around the globe, which includes meters for measuring length.
A meter is defined as the distance light travels in vacuum in 1/299,792,458 of a second.
In contrast, feet, inches, and miles are units of measurement used in the U.S customary system, not the metric system.
Learn more about metric system