In materials of the same phase, or state of matter, the speed of sound tends to decrease as the density increases. Is this true or false and why?

False because the molecules of a denser substance have less inertia and move very quickly as compared to molecules of a less dense substance.

True because the molecules of a denser substance have less inertia and do not move as quickly as molecules of a less dense substance.

False because the molecules in all substances have no inertia so it does not have any effect.

True because the molecules of a denser substance have greater inertia and do not move as quickly as molecules of a less dense substance.