Answer:
A. Molecular solids
Step-by-step explanation:
Bonds between two or more molecules is the force of attraction between the molecules. If the force of attraction is strong between the molecules then the matter must be solid.
If the force of attraction is very weak then in that case the material is liquid and for more weak force we can say that the material is gas.
So here melting point depends on the force of attraction in which if the force is more then the melting point must be high. So here for lowest melting point we need to find a material in which the force of attraction is weak.
So out of all given option the weak attraction force is only in
A. Molecular solids