The impact of noise pollution on human health is governed by: (a) Intensity of…

Concept: The health impact of a noise event on a listener is governed by the physical and physiological parameters of the sound itself — how loud it is (intensity), how long it lasts (duration), what pitch range it spans (frequency range), and how sensitive the listener's ear is. Environmental-health and occupational-safety references treat these acoustic and physiological parameters as the direct determinants of hearing and health outcomes from noise exposure.

Application: Of the five listed factors, intensity, duration, sensitivity of the human ear, and frequency range are all parameters of the sound event or the receiver's physiology, and each independently shapes how strongly a given exposure affects hearing and health. An individual's socio-economic status can influence which noisy environments a person is exposed to, but it does not itself change how loudly, how long, or at what pitch a sound strikes the ear once exposure occurs — so it is not a direct determinant of the impact.

Cross-check: Contrasting the combinations offered makes the distinction clear:

• a), b) and c) only — pairs socio-economic status with just two acoustic parameters, treating a person's economic context as if it were a physical property of the sound.

• a), c), d) and e) only — again elevates socio-economic status to the same footing as the acoustic/physiological parameters, when it only shapes exposure circumstances, not the sound's direct effect.

• a), b), c), d) and e) — bundles every listed factor together, folding socio-economic status in alongside the genuine acoustic/physiological determinants rather than separating exposure context from mechanism.

Result: Only intensity, duration, sensitivity of the human ear, and frequency range are direct determinants of noise's impact on health, so the governing set is a), b), d) and e) only.