As we know that ,
Humans come under the class Animals.
Birds come under the class Aves.
From above it is clear that option ( C ) represents the best relationship between Humans, Birds and Animals.

On the basis of above given question , we can say that
Apple is different from orange but both are fruits.
Therefore, option ( B ) represents the best relationship between Fruits, Apples and Oranges. As shown in given venn - diagram .

As we know that ,
Some teachers may be painters and vice-versa.
Some teachers may be dramatists and vice-versa.
Some painters may be dramatists and vice-versa.
Some teachers who are painters may be dramatists.
It is clear that option ( D ) represents the best relationship between Teacher, Painter and Dramatist.

On the basis of above given question , we can say that
Some lecturers may be doctors and vice-versa.
Some Government servants may be lecturers and vice-versa.
Some Government servants may be doctors and vice-versa.
Some Government servants who are lecturers may be doctors.
Some doctors who are lecturers may be Government servants.
Therefore , option ( D ) represents the best relationship between Government Servants, Lecturers and Doctors. As shown in given venn - diagram .

As per the given above question , we can say that
Some children may be serious.
Some children may be naughty.
Naughty is different serious.
From above it is clear that option ( A ) represents the best relationship between Children, Serious and Naughty. As shown in given venn - diagram .

As we know that ,
MK Gandhi, Umesh Chandra Bandopadhyay, Jatin Das and Surya Sen, are different persons.
From above it is clear that option ( B ) represents the best relationship between M .K. Gandhi, Umesh Chandra Bandhopadhyay, Jatin Das and Surya Sen. As shown in given venn - diagram .

As per the given above question , we know that
Some black eyed people may be brown haired and vice-versa.
Some black eyed people may be Indians and vice-versa.
Some brown haired people may be Indians and vice-versa.
Some black eyed and brown haired people may be Indians and vice?versa.
Therefore , option ( A ) will be correct .

According to question , we know that
Milk is different from River water .Both Milk and River water belong to Liquids .
From above it is clear that option ( C ) is required answer .

From the given diagram , we can say that
Number of educated youth are poor = 11 + 3 = 14
Therefore , 14 educated youth are poor .

From above given question , we can say that
Youth Club , Political Party and Youths represent the best relationship among Human Society . As shown in given diagram .
Therefore , required answer will be option B .