A block of mass m is placed on a wedge. The wedge can be accelerated in four manners marked as (1), (2), (3) and (4) as shown. If the normal reactions in situation (1), (2), (3) and (4) are N₁ ,N₂ ,N₃ and N₄ respectively and acceleration with which the block slides down relative to the wedge in situations are b1, b2 , b3 and b4  respectively then: 

A)N3 > N1 > N2 > N4     B)b2 > b3 > b4 > b1   C) b2 > b3 > b1 > b4    4D) N4 > N3 > N1 > N2  

1) AB 2) CD 3) AC 4) ABC