Right option is (a) False
Explanation: Canals are human-made channels for water conveyance, or to service water transport vehicles. In most cases, the engineered works will have a series of dams and locks that create areas of low speed current flow. These areas are referred to as slack water levels, often just called levels.
An canal is also known as a navigation when it parallels a river and shares part of its waters and drainage basin, and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley.