Concept:The most effective way to manage worn-out machinery and plastics is to recycle them rather than dump or burn them.
Explanation:Worn-out machinery and plastics contain materials that can harm the environment when not properly managed.
Burning them completely releases poisonous gases and smoke into the air, which causes air pollution.
Burying them deep in the soil may contaminate the land and underground water sources.
Throwing them far away from the sea only shifts the problem because the waste still pollutes the environment.
Recycling allows these waste materials to be reprocessed into new, useful products.
This practice reduces the volume of waste, prevents environmental pollution, and conserves natural resources.
Answer:C. recycle them for other uses.