The intermolecular spaces are minimum in the case of:
Solids
The explanation for the correct option: (a) In solids, the particles are very closely packed and the intermolecular force of attraction is very strong.
The explanation for the incorrect options: (b) In liquids, the particles are less closely packed than in solids and the intermolecular force of attraction is weaker than in solids.
(c) In gases, the particles are very loosely packed and the intermolecular force of attraction is very weak.
(d) With respect to the packing of particles and intermolecular force of attraction, water behaves like any other liquid.
Hence, option (a) solids is the correct answer, as in solids the intermolecular space is minimum.