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The primary purpose of a level in construction is to determine if a surface is horizontal (level) or vertical (plumb). This tool is essential in ensuring that structures are built accurately and safely. A level helps carpenters and builders confirm that surfaces, such as floors, walls, and countertops, are aligned correctly, which is crucial for the overall integrity and aesthetics of the construction project.

When surfaces are not level or plumb, it can lead to problems such as uneven flooring, misaligned cabinetry, or structural instability. Using a level allows workers to make necessary adjustments before further construction activities proceed, thereby avoiding costly corrections later on. Thus, understanding how to use a level effectively is vital for anyone involved in the building or construction industry.

The other options relate to different tools or methods that serve distinct purposes, such as cutting materials or measuring angles. While aligning plumbing systems is important, it does not capture the primary and most common use of a level in overall construction practices.