Avel is an ergonomist. He plans to measure the amount of office space per employee. What would be an appropriate unit for Avel's purpose?

The most appropriate would be people per square meter

This is done to calculate the density of the population, or in this case the density of employees in an office space. He would find out how many people are found on each squared meter of an office space and would see based on this how it would be best to reorganize the the office space if reorganization was necessary.