Which of the following is an effective way to eliminate static electricity?

Grounding is an effective way to eliminate static electricity because it provides a direct path for electric charges to flow into the ground, thereby neutralizing any built-up static charge. When an object is grounded, excess electrons can dissipate safely into the earth, preventing static discharge which can lead to sparks or electrical shocks. This method is particularly important in environments where flammable materials or sensitive electronics are present, as static electricity can ignite vapors or damage components.

In contrast, while materials such as plastics can be insulators and may help in reducing the transfer of electricity, they do not actively dissipate static charges. Wearing rubber shoes can also contribute to insulating against ground contact, which is counterproductive to eliminating static. Increasing humidity can help by making the air more conductive, allowing static charges to dissipate more easily; however, grounding is a more direct and reliable method for static elimination, making it the most effective choice in this scenario.