Solution

Lyophilic solutions are usually more stable than lyophobic solutions because of extensive solvation i.e. the colloidal particles are covered by the liquid in which they are dispersed. Thus A is correct.
The stability of lyophobic solution is due to presence of charge on colloidal particles. If the lyophobic solution loses charge, they come together and result in coagulation, thus the charge present in them stabilizes it. Thus B is correct.
Lyophilic colloids can protect lyophobic colloids when a lyophilic colloid is added to a lyophobic solution. The lyophilic particles form a layer around lyophobic particles and thus protect it from electrolytes. Thus lyophilic colloids are protective colloids. Thus C is correct and D is incorrect.