Many occupational health guidelines suggest that long-term exposure to sound levels of about 85 dB or higher can cause noise-induced hearing loss. Above this level, the sensitive hair cells in the inner ear can be damaged over time, so protective measures are required.
Option A:
Option A is correct because 85 dB is a widely used benchmark for continuous occupational noise that requires hearing protection and control measures.
Option B:
Option B is incorrect; 25 dB corresponds to very quiet environments and does not harm hearing.
Option C:
Option C is incorrect because about 40 dB, typical of a quiet library, is generally safe and even desirable for concentration.
Option D:
Option D is incorrect; 10 dB is an extremely soft sound and poses no risk of hearing damage.
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