Final answer:
The 80/20 principle suggests that while advertising, sales, and promotions can bring profits to a company, there will always be some customer defection, which has the potential to grow larger.
Step-by-step explanation:
The correct option for the given statement is C. 80/20 principle. The 80/20 principle, also known as the Pareto principle, states that 80% of the effects come from 20% of the causes. In the context of the question, it means that 80% of the profits come from 20% of the customers. This principle suggests that while advertising, sales, and promotions can bring profits to a company, there will always be some customer defection, which has the potential to grow larger.