Reducing lake acidity in New England mainly relies on technology that:

The correct answer highlights the critical role of limiting emissions from coal-fired power plants in addressing lake acidity in New England. As coal-fired power plants emit sulfur dioxide and nitrogen oxides, these pollutants can lead to the formation of acid rain when combined with moisture in the atmosphere. This acid rain can significantly lower the pH of lake water, making it more acidic. By implementing technology that reduces these emissions, it is possible to decrease the frequency and intensity of acid rain events, ultimately helping to maintain or restore the natural acidity levels of the lakes and supporting aquatic ecosystems.

Considering other approaches, controlling soil erosion, removing road salt, and minimizing agricultural pollution all play essential roles in environmental management; however, they do not directly correlate to addressing the primary source of lake acidity as established through the relationship between power plant emissions and acid rain formation.