A scientist measures the speed of a sound wave in five different locations as it travels across a region, and then plots a graph of the data as shown. Select the best explanation for the data that were obtained. A.
The sound wave travels through a vacuum in locations 1–3.
B.
The sound wave travels through a vacuum in locations 4–5.
C.
The sound wave travels from a gas to a liquid between locations 3 and 4.
D.
The sound wave travels from a solid to a gas between locations 3 and 4.