Which one of the following statements is correct? A. The canal system and the drainage system are complementary B. The canal system runs on ridges, gets divided into smaller channels and spreads its water on the land C. The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream D. All the above

The correct answer is D. All of the above.

A canal system is a network of artificial channels that are used to transport water for irrigation, drainage, or transportation. A drainage system is a network of artificial channels that are used to collect and remove excess water from the land.

The canal system and the drainage system are complementary in that they both serve to manage water resources. The canal system provides a way to transport water to where it is needed, while the drainage system helps to remove excess water from the land.

The canal system runs on ridges, gets divided into smaller channels and spreads

its water on the land. This helps to ensure that the water is evenly distributed and that it reaches all of the crops that need it.

The drainage system runs along the lowest line, collects drainage water from the slopes and joins the main stream. This helps to prevent flooding and to keep the water flowing smoothly.

Therefore, all of the statements in the question are correct.