What practice involves managing resources by using, reusing, or recycling materials?

The practice of managing resources by using, reusing, or recycling materials is best captured by the concept of "Reduce, reuse, recycle." This phrase encompasses a comprehensive approach to resource management that emphasizes not only minimizing waste but also maximizing the utility of materials throughout their lifecycle.

Reduce involves lessening the amount of waste generated in the first place, while reuse focuses on finding new ways to use items that might otherwise be discarded. Recycling refers to processing materials so they can be used again in the production of new items. Together, these actions create a more sustainable approach to consumption and waste management, aiming to lessen the overall environmental impact of human activities.

The other choices represent different aspects of resource management but do not encapsulate the full cycle of using, reusing, and recycling materials as effectively. Conservation, for example, generally refers to the careful management of natural resources to prevent depletion, but it does not specifically include the practices of reusing or recycling. Reduction is about minimizing waste production, which is a part of the larger phrase. Disposal simply refers to the act of getting rid of waste, without any emphasis on sustainability practices.