The correct option is C colloidal solution are of small order as compare to those of true solution
Colligative property is the properties of a solution that depend upon the number of solute particles irrespective of the identity of solute.
Thus, colligative property does not depend on the nature of particle i.e., shape, size, charge, etc.
Colloidal particles are bigger aggregates. Thus, the number of particles, per unit volume, in a colloidal solution is small as compared to a true solution.
Therefore, at same concentration colligative property values of colloidal solution is lesser than true solution.
Hence, option (c) is the correct answer.