Here's why:
* Solids: The particles in a solid are tightly packed and have a fixed arrangement. This makes it very difficult to compress them. Think of a rock - you can't easily squeeze it into a smaller space.
* Liquids: Liquids have particles that are closer together than gases but can still move around. While they're harder to compress than gases, they can still be compressed to some degree. Think of squeezing a bottle of water - you can reduce its volume.
* Gases: Gases have particles that are far apart and move freely. This makes them very easy to compress. Think of filling a balloon with air - you're compressing the air into a smaller space.
In summary: Solids are the most resistant to compression because their particles are tightly packed and fixed in position.
