Sound Wave A is moving through a medium that is decreasing in temperature. Sound Wave B is moving from a liquid to a gas medium. Which statement can be made about both waves?

Sound travels more slowly in a medium as its temperature decreases, so Sound Wave A slows down. Sound also generally travels more slowly in a gas than in a liquid, so Wave B slows down when it moves from liquid to gas. Therefore, both waves will slow down; the correct choice is C.

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