What factors should be considered when selecting a control method for aquatic pests?

When selecting a control method for aquatic pests, it is crucial to consider multiple factors to ensure an effective and responsible approach. Efficacy refers to how well the method works in controlling or eliminating the pests in question, which is fundamental since the goal of pest management is to achieve desired outcomes. Environmental impact is equally important, as certain methods may pose risks to non-target species, water quality, and ecosystems. Choosing a method that minimizes harm to the surrounding environment is essential for sustainable pest management.

Cost is also a significant consideration, as it affects the feasibility and practicality of implementing a control method. However, cost should not be the sole factor; balancing efficacy and environmental safety against financial constraints is necessary for responsible decision-making. Lastly, pest characteristics—such as the species involved, life cycle, and behavior—play a vital role in guiding the choice of a method suitable for effectively targeting the specific pests present.

In summary, a holistic approach that takes into account efficacy, environmental impact, cost, and pest characteristics leads to more informed and effective pest management strategies, making option B the most comprehensive and valid choice.