Final answer:
The benefits of a control should exceed the perceived difficulty.
Step-by-step explanation:
The correct answer to the question is 2) exceed. The benefits of a control should exceed the perceived difficulty. This means that the advantages or positive outcomes of implementing a control measure should be greater than the perceived challenges or obstacles that come with it.
For example, if we consider the given information about water, there is an improvement in its quality when we use it. In this case, the benefits of using water, such as cleanliness or hydration, exceed any negative impacts or difficulties associated with its use.