Identify the shaded region in the figure. A and B are two sets represented by the circles. U is the universal set, which is represented by the rectangle.
U-B'-( A∩B)
The region in the figure is only B. B-A is removing the parts common to A and B from B.
This is exactly what we have in the figure, from B, A∩B is removed.
The last option also gives the same. When we subtract B′ from U, we get B.
So the expression U−B′−(A∩B) becomes B−(A∩B). This is same as B−A.