Which of the following is true about light waves and sound waves?

Question

Sound waves and light waves travel at the same speed through different materials.
Light waves can move at different speeds, but sound waves always move at the same speed
Sound waves can move at different speeds, but light waves always move at the same speed.
They each travel at different speeds when moving through different materials.

Answer 1

Sound waves can move at different speeds, but light waves always move at the same speed.