Gases are the most compressible of the three states of matter, so the cup containing the solid and the liquid would be the least compressible. When Tinna squeezes the cup with the solid and liquid, they will not compress much. On the other hand, when Tinna squeezes the container with the gas, the gas particles will be compressed and the container will change shape. This is because gas particles are much more spread out than the particles in solids and liquids, so there is more space for the particles to move closer together when the gas is compressed.