What is a compass primarily used for?

A compass is primarily used as a navigational tool that indicates direction, which is why the selected answer is correct. It operates on the principle that a magnetized needle aligns itself with Earth's magnetic field, pointing toward the magnetic North Pole. This ability to indicate direction has made compasses invaluable for navigation across centuries, from ancient mariners setting sail to modern hikers and explorers.

The other options, while associated with different tools and measurements, do not pertain to the primary function of a compass. For instance, temperature measurement relates to cooking tools such as thermometers, sound level measurement involves devices like sound meters, and crafting and drawing lines are tasks typically completed with tools like rulers or straightedges. Each of these tools has its own specific applications, which are distinct from the directional purpose of a compass.