Sound travels fastest in solids due to the close packing of particles. In liquids, such as water, sound is slower, and it travels even slower in gases, like air. Therefore, the type of material through which sound travels at the highest speed is solids. ;
Sound travels fastest in solids, due to the closely packed particles that allow efficient transmission of vibrations. In contrast, sound travels slower in liquids and slowest in gases. Therefore, the correct answer is A. Solids .
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