How should old oil be disposed of?

Answer: C — Correctly at the local authority site

Disposing of old oil correctly at a local authority site is important for environmental protection and public health. Used oil can contain harmful contaminants that, if discarded improperly, may leak into the ground, cause soil and water pollution, and pose risks to wildlife and ecosystems. Local authority recycling or disposal sites are specifically equipped to handle hazardous materials like used oil, ensuring it can be recycled or disposed of safely. While some might consider taking it to a gas station, this option is not universally available, as not all gas stations accept used oil. Pouring old oil down the drain or incidentally into the ground poses significant environmental risks and is often illegal due to the potential for water contamination. Therefore, the best practice is to take it to a designated site that follows the regulations for hazardous waste disposal.