Concept:Drainage is the natural system that includes surface water bodies such as rivers, lakes, and streams.
Explanation:Rivers and lakes are part of a drainage system.
A canal is an artificial waterway, not a general term for water bodies.
A ditch is a small, usually artificial channel.
An ocean is a large saltwater body, but it does not include rivers and lakes.
Therefore, drainage is the correct term that refers collectively to water bodies like rivers and lakes.
Answer:C. Drainage