The correct answer is D) All of the above. Pollution of the waterways can result from the discharge of various substances, including: A) Galley trash can - Improper disposal of galley trash can contribute to the pollution of waterways. B) Sewage - The discharge of untreated sewage into the water is a major source of water pollution. C) Oily mixture of one part per million - The discharge of oily mixtures, even at low concentrations, can contaminate the waterways and harm marine ecosystems. All of these types of discharges, if not properly managed or disposed of, can contribute to the pollution of the waterways and are regulated under various environmental laws and regulations.