Manager, Labour Union and Worker

As we know that ,
Lion is different from fox. But both are carnivorous.
It is clear that option ( C ) represents the best relationship between Lion, Fox and Carnivorous. As shown in given venn - diagram .

On the basis of above given question , we can say that
Soda water is different from Mineral water.
But both are liquid.
Therefore , option ( A ) represents the best relationship between Soda Water, Mineral Water and Liquid. As shown in given venn - diagram .

On the basis of above given question , we can say that
Pilot sits in aeroplane and he flies aeroplane in the sky.
Therefore , option ( A ) represents the best relationship between Aeroplane , Pilot and Sky. As shown in given venn - diagram .

On the basis of above given question , we know that
Human Society - Youth Club is different from a political party. Some youth may be members of political party and some other youth may be members of Human Society - Youth Club.
Therefore , option ( B ) represents the best relationship between Human Society ? Youth Club, Political Party and Youths. As shown in given venn - diagram .

As we know that ,
All sisters are females.
Some sisters are teachers.
Some teachers are females.
It is clear that option ( D ) represents the best relationship between Females, Sisters and Teachers. As shown in given venn - diagram .

As we know that ,
Some teachers may be writers and vice-versa.
Some teachers may be musicians and vice-versa.
Some writers may be musicians and vice-versa.
Some writers who are teachers may also be musicians.
From above it is clear that option ( B ) represents the best relationship between Teacher, Writer and Musician.

As per the given above question , we can say that
Women, children and school are all different.
It is clear that option ( B ) represents the best relationship between School, Women and Children. As shown in given venn - diagram .

As we know that ,
Lion is different from fox.
But both are carnivorous.
From above it is clear that option ( C ) represents the best relationship between Lion, Fox and Carnivorous. As shown in given venn - diagram .

As per the given above question , we can say that
Pea is different from kidney bean. But both are Leguminous seeds.
From above it is clear that Peas and Kidney Beans belong to Legumes Seeds .Hence , required answer is option ( B ) .

From above given diagram , we can say that
The number '3' is common to all the three circles.
Hence , 3 students study all the three subjects .