Solution:(A) Full Keynesian System, assuming normal conditions: Here, the crowding out effect is the highest because this system is built on normal conditions and incorporates various aspects of economic activity.
(C) IS-LM Framework, assuming normal conditions: In this framework, the crowding out effect is less than in the Full Keynesian System but is still significant because it is based on the precondition of normal conditions.
(A) Classical Macro Model: In these models, the crowding out effect is at a medium level. These models include various aspects of economic activity but are not based on the precondition of normal conditions.
(D) Simple Keynesian Model: In these models, the crowding out effect is the lowest. These models focus on only a few specific aspects of economic activity and are not based on the precondition of normal conditions.
Note: The commission/examining body considered the answer to this question to be option (a) A. B, C, D.