Answer:
A. Variables are investigated in a natural context.
Explanation:
The Primary Advantage of Field Experiment is that they are conducted in a real world / real - life settings, and most of the time, in a manner that is not noticeable to the sample or variables of experiment.
Thus, field experiment mirror the actual happenings of the real world.
Unlike Laboratory experiment, which is undertaken in a man-made and well influnced setting of a laboratory.
