Using the given information that sound travels through room temperature air at 343 m/s, we can compare the speeds of the sound wave in the table with this value.
If the speed in medium A is greater than 343 m/s, it suggests that medium A is the solid, as sound waves generally travel faster in solids than in gases or liquids.
Similarly, if the speed in medium B is between 0 m/s and 343 m/s, it suggests that medium B is the liquid since sound waves usually travel slower in liquids compared to gases or solids.
Finally, if the speed in medium C is 343 m/s or less, it suggests that medium C is the gas, as the speed matches that of sound traveling through room temperature air.
Based on this reasoning, the correct answer is:
A is the solid, B is the liquid, and C is the gas.