Which tool is used for leveling over long distances?

The tool used for leveling over long distances is the line level. A line level is specifically designed to ensure that a string or line is perfectly horizontal over a significant span, which is essential in various applications such as construction, landscaping, and agricultural practices. When setting up a line for tasks like grading or laying out a garden, the line level can be securely attached to a taut line, allowing for precise leveling. This capability makes it indispensable for ensuring that surfaces are even over large areas, which is crucial for water drainage and structural integrity.

In contrast, a hose bib is a water faucet, a lag screw is a fastening device, and long nose pliers are tools for gripping and manipulating small objects. None of these tools serve the specific purpose of leveling over extended distances like the line level does. Therefore, understanding the specific application and function of the line level clarifies why it is the correct answer for this question.