Which one of the following does not apply to sound waves in fluids?

Sound waves do transport energy through the medium, require a material medium for propagation (they cannot travel through vacuum), and travel faster in liquids than in gases due to the higher elastic moduli (bulk modulus) of liquids. In fluids (gases and liquids), sound waves can only propagate as longitudinal (compressional) waves because fluids cannot sustain shear stresses required for transverse waves. Hence the statement that they are transverse does not apply to sound waves in fluids.