Some females can be doctors; some female can also be patient. Some Doctors can be patients. So, option (C) is the correct answer.

Some men can be detectives; some spies can be men; some men can be spies; and some men can detective and spies both. So, option (C) is the correct answer.

All males are Human beings so the circle for male come in between human being; and all fathers are male so the circle for fathers comes in between the male circle. So, option (C) is the correct answer.

In a building material we use steel and wood. So, steel and wood circle comes in the building material circle. But both are different from each other. So, option (A) is the correct answer.

Some teachers can be Doctor and can be Engineer. But there is no direct relation between Doctor and Engineer. So, option (B) indicates the best relation among the classes in which the middle circle denotes teachers.

Blizzard means a severe snowstorm and Freeze means the result of extreme cold i.e. the result of Blizzard is Freeze.
Insult means speak with disrespect and Humiliation means a state of being someone feel ashamed i.e.
the result of insult is humiliation.
Blizzard : Freeze :: Insult : Humiliation

Graceful means showing elegance and clumsy means ungraceful or awkward. Both are opposite to each other. Similarly, laugh and cry are opposite to each other.

Zenith means the time at which something is most powerful and Nadir means the lowest or most unsuccessful point in a situation. Both words are opposite to each other.
Genuine means authentic and phony means fraudulent or not genuine. Both are also opposite in meaning.
Zenith : Nadir :: Genuine : Phony

Pedagogy means method and practice of teaching.
Similarly, Entomology is a branch of zoology concerned with the study of insects.
So, Pedagogy : Teaching :: Entomology : Insects

Capriciousness means to describe a person or thing that’s impulsive and unpredictable and Reliability is the quality of being trustworthy.
Tenacious means tending to keep a firm hold of something and Practicality means possibility A person who is `Capricious’ loses `Reliability’. In the same way, if a person is `Tenacious’ he loses `Practicality’.