Four Venn diagrams are given below. You have to select the option that shows the best relationship among the three given classes.

Mother, sister, female

Given: Mother, sister, female

Based on the relationship among the given words, Correct Venn diagram will be:

As per the Venn diagram:

All Mothers are Female. 
All Sisters are Female.

A Female can be both a Mother and a Sister.

thus, the correct option is (d)