What is the purpose of using the trim tool in CAD applications?

The purpose of using the trim tool in CAD applications is to remove intersections between lines. This tool is specifically designed to help users maintain a clean and precise drawing by allowing them to eliminate unwanted segments where lines or shapes intersect. When working on technical drawings or designs, ensuring that shapes and lines are neatly defined without excess overlap is crucial for clarity and accuracy.

By utilizing the trim tool, CAD users can effectively cut away portions of lines that are no longer needed, which improves the overall integrity and presentation of the design. This function is essential in various design processes, such as architectural drafting, mechanical engineering, and any scenario where precise geometrical relationships are necessary.

The other functions mentioned, such as creating 3D models, extending lines, or adjusting scales, serve different purposes and involve other tools within a CAD program. The trim tool specifically focuses on refining shapes and ensuring clean intersections, making option C the clear choice.