Please provide the explanation on how to solve this

In option a and c: 3 elements are in  single class and one in other class. In Option B, maximum diffusion,2 in each class. In option D all elements are in class ¼. Hence max ent...

The first order estimate of image entropy is maximum so we will get an answer of a = 1/4, b =1/4, c=1/4, d=1/4