The type of design the school administrator is using is known an non-equivalent control group design.
The school administrator said he wants to compare records of a school that has no lockers with that of a school that has lockers. Hence, the answer to this question is non equivalent control group.
A non equivalent control group is a treatment group and a control group which are measured and compared after getting data from both groups at the beginning and at the end of a research program.
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The distinction between flexible and fixed individual differences is that managers have little or no impact on fixed differences. Fixed differences in this case are often differences where the person who exhibits a certain characteristic is also the person who won't be changing them so soon. And this is a thing where managers have little say over it.
The answer is D.
Factor production that could be changed during particular period is called Variable Factor of Productions.
Basically, factor of productions is divided to fixed and variable factor.
FIxed factors are the one that will always stay the same no matter how many products you made. For example electricity cost, building rent, etc
The variable factors differ depend on how product you produce, such as raw material.