Gases can be compressed significantly, as their particles are far apart and have more space between them. While liquids can be compressed to a much lesser extent, solids are generally not compressible. Therefore, the most accurate response is that gases can be compressed, although liquids can be compressible under certain conditions as well.
In summary, while the best answer is gases, it's also worth noting that solids, liquids, and gases can all be compressed to varying degrees, although the degree of compressibility differs greatly among the states.
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