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(C) When the plate $P$ is removed,both the wedge $B$ and the block $A$ fall freely under gravity.Both $A$ and $B$ experience an acceleration equal to

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zero

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(C) When the plate $P$ is removed,both the wedge $B$ and the block $A$ fall freely under gravity.Both $A$ and $B$ experience an acceleration equal to the acceleration due to gravity,$g$,in the downward direction.Consider the block $A$ in the frame of reference of the wedge $B$.Since both are accelerating downwards at $g$,the pseudo-acceleration of block $A$ with respect to wedge $B$ is $g$ upwards.Therefore,the effective acceleration of block $A$ relative to wedge $B$ is $g - g = 0$.Since there is no relative acceleration between the block $A$ and the wedge $B$,the block $A$ does not press against the surface of the wedge $B$.Thus,the normal force $N$ exerted by the wedge $B$ on the block $A$ is zero.

In the figure shown,$P$ is a plate on which a wedge $B$ is placed,and on $B$ a block $A$ of mass $m$ is placed. The plate is suddenly removed and the system of $B$ and $A$ is allowed to fall under gravity. Neglecting any force due to air on $A$ and $B$,the normal force on $A$ due to $B$ is

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