Where do sound waves travel faster?

Question

through denser materials, because the molecules in a tightly packed medium collide more frequently
through less dense materials, because the molecules in a loosely packed medium collide less frequently
through less dense materials, because the molecules in a loosely packed medium collide more frequently
through denser materials, because the molecules in a tightly packed medium collide less frequently

Answer 1

Sound waves travel faster through denser materials, because the molecules in a tightly packed medium collide less frequently.