The shaded region in the adjoint diagram represents

The venn diagram contains 2 sets, and they are overlapped which means they have common elements in it.

In the venn diagram B is completely shaded Except the overlapped part with A that means “it shows the elements of B by eliminating the common elements of A”

Since we are eliminating the elements of A in B this can be written as B-A.

Option D is the correct answer.