Final answer:
Sound waves can travel through solids, liquids, and gases making the correct answer a) Solid, b) Liquid, and c) Gas.
Step-by-step explanation:
Sound waves are a type of longitudinal wave that travels through a medium. They can travel through solids, liquids, and gases. In solids, sound waves can be both longitudinal and transverse, while in fluids like air and water, they are only longitudinal. Therefore, the correct answer is a) Solid, b) Liquid, and c) Gas.