Final answer:
The Pareto Principle, also known as the 80/20 rule, suggests that approximately 80% of phenomena stem from 20% causes.
Step-by-step explanation:
The best description of the Pareto Principle is c. Approximately 80% of the phenomena stem from 20% causes. This principle, also known as the 80/20 rule, suggests that in many situations, a small number of causes or inputs are responsible for the majority of the effects or outcomes.
For example, in a sales context, it could mean that 80% of a company's sales come from 20% of its customers.