What is the range of rules covered in Part C?

The correct range of rules covered in Part C of the COLREGs is from rule 4 to rule 18. This section is essential as it outlines the conduct of vessels in any condition of visibility and primarily addresses the behavior of vessels when they encounter one another at sea.

Part C includes critical rules that set the standards for navigation and gives clarity on who has the right of way in various scenarios, ensuring safer coexistence of vessels on the water. It is crucial for mariners to know these rules to avoid collisions and navigate effectively.

The range designated in option C, which spans rules 20 to 31, actually pertains to signals and lights details related to the conduct of vessels. Therefore, while it touches upon aspects important for navigation, it does not cover the same foundational rules as those outlined in Part C, which are crucial for understanding the basic responsibilities of vessels.