Final answer:
The correct option is (C). 12 inches for ventilation and cleaning. Dishwashing machines should be placed 6 inches off the floor to prevent flooding, for easy maintenance and repairs, and for better ventilation and cleaning.
Step-by-step explanation:
Dishwashing machines should be placed 6 inches off the floor to prevent flooding. Placing the machine higher helps to prevent water damage in case of leaks or spills. In addition, having a gap between the floor and the dishwasher allows for easy access for maintenance and repairs.
This space allows technicians to reach the necessary components without having to move the machine or disassemble it completely. Lastly, raising the dishwasher off the floor also provides better ventilation and easier cleaning. With more space underneath, it is easier to clean the area and circulate air, improving the machine's performance and lifespan.