Sound travels fastest through solids because particles are closer together, allowing vibrations to transmit more efficiently. Among the options provided:
- A) Across a room (air - a gas)
- B) In a swimming pool (water - a liquid)
- C) Through outer space (a vacuum, where sound cannot travel)
- D) Through a railroad track (a solid)
The fastest medium for sound to travel in this scenario is D) through a railroad track.
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