Which sequence correctly completes the statement: Water is the liquid medium used to ___ wastes from their point of origin, through the ___ system and to the ___ plant?

• A. Convey - collection - treatment
• B. Transport - sewer - discharge
• C. Move - pipeline - processing
• D. Carry - channel - purification

Answer: (A)

The idea being tested is the standard terminology for how wastewater is moved from its source to treatment. Water serves as the medium that conveys wastes along a defined pathway: it is conveyed from where wastes originate, through a collection system, and into a treatment plant. Convey fits perfectly for describing the movement through a network, the collection system is the network of pipes and lines that gather waste from many sources, and the treatment plant is where the wastewater is treated before any discharge. The other options use less precise or nonstandard terms for this sequence—for example, “sewer” is a less formal substitute for the collection system, and “discharge” refers to the final release rather than the plant; “move” with “pipeline” and “processing” or “purification” aren’t the conventional terms used together in this context.