Sound waves are compression or longitudinal waves that travel through matter. Sound travels through all three mediums, solids, liquids, and gases, at different speeds. Which statement BEST explains why sound travels fastest through solids and slowest through gases?
A. Molecules in solids are spread apart while molecules in air are grouped together in clusters.
B. Hard surfaces of solids cause sound waves to bounce off more quickly than in gases.
C. Tightly-packed molecules of solids vibrate more quickly than loosely-packed gas molecules.
D. It is easier for waves to pass through gases, then liquids, then solids.
