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C. X is the solid, Y is the liquid, and Z is the gas.
This can be determined by comparing the speeds of the sound waves through each medium to the known speed of sound in air. Sound travels faster through solids, then liquids, and slowest through gases. In this case, the speed of sound through medium X (972 m/s) is closer to the speed of sound in air (343 m/s) than the speed through medium Y or Z, indicating it is a solid. Medium Y has a speed of 1,483 m/s, which is greater than the speed of medium Z (5,940 m/s), so Y is the liquid and Z is the gas.