- Statement A is correct: The perceived loudness of sound is approximately logarithmic with respect to intensity, which is why the decibel scale (a logarithmic scale) is used. - Statement B is incorrect: The human ear's sensitivity is highly dependent on frequency. It is most sensitive to frequencies in the range of 2 kHz to 5 kHz and less sensitive to very low or very high frequencies within the audible range (typically 20 Hz to 20 kHz). This varying sensitivity is represented by equal-loudness contours (Fletcher-Munson curves or ISO 226 curves). - Statement C is correct: The principle of superposition states that when multiple waves pass through the same medium, the net displacement at any point is the vector sum of the displacements caused by each individual wave. This applies to sound waves. - Statement D is correct: Longitudinal waves, like sound waves, can travel through solids, liquids, and gases because these media can support compressions and rarefactions. Transverse waves, on the other hand, require a medium that can sustain shear forces, typically solids or the surface of liquids.