All of the statements you provided about hearing protection are true:
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Earplugs and earmuffs are the most common types of hearing protection devices. - This is correct. Earplugs and earmuffs are widely used to protect against hearing loss in noisy environments.
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Long exposure to high levels of noise can damage your hearing. - This is also true. Prolonged exposure to loud noise can lead to noise-induced hearing loss.
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OSHA requires your employer to provide you with hearing protection when you are exposed to loud noises for an extended period of time. - Correct. The Occupational Safety and Health Administration (OSHA) mandates that employers must provide hearing protection to employees exposed to noise at or above a certain level.
So, you can select all the statements as true.