Answer:
Option B, meter
Step-by-step explanation:
In the metric system also known as MKS system the three primary unit of measurement are -
a) M - Meter to measure the distances/lengths
b) K- Kilogram to measure the weights and
c) S-seconds to measure the time.
Thus, among the given options , option B meters is the correct choice of answer
Feet is also a unit of measurement but it is a part of FPS system of measurement.