The state of matter which can easily be compressed, is_____________________.
gas
Gas: The molecules are far away from each other and have large intermolecular spaces so they are highly compressible.
The explanation for the Incorrect option -
Solids & Liquids: The molecules of solids and liquids are closely packed, so they have fewer intermolecular spaces between the molecules. Hence are incompressible.
Thus, the correct option is C.