What is one method to prevent corrosion?

Coating with protective materials is an effective method to prevent corrosion. Corrosion typically occurs when metals, such as iron, react with oxygen and moisture in the environment, leading to the deterioration of the material. By applying a protective coating, such as paint, oil, or a layer of another metal like zinc (in galvanization), the underlying metal is shielded from direct contact with corrosive elements like water and oxygen. This barrier significantly reduces the rate at which corrosion can occur, thereby extending the lifespan of the metal object.

The other options do not provide any actual benefit in preventing corrosion. Allowing exposure to air would increase the likelihood of corrosion as both air and moisture accelerate the process. Using cheaper materials does not inherently prevent corrosion; in fact, these materials might be even more susceptible to rust and decay. Increased exposure to moisture is a direct factor that contributes to corrosion, so it would have the opposite effect of what is desired.