Which of the following diagram represents Mammals, Cows and Crows?

According to above given question , we can say that
Some guides may be philosophers and vice versa.
Some friends may be guides and vice versa.
Some friends may be philosophers and vice versa.
Some philosopher guides may be friends.
From above it is clear that option ( C ) gives the best relationship between Friend, Guide and Philosopher .

According to above given question , we know that
Doctors consists of Specialist Doctors and Patients but Specialist Doctors and Patients are of two different nature.
Hence , Option (B) is correct.

According to question , we have
Delhi and Srilanka both are in Asia.
From above it is clear that option B represents the best relationship among Delhi, Sri Lanka and Asia .As shown in given figure .

According to question , we know that
Sun is Stars.
Sun and Stars are in Universe .
From above it is clear that option B represents the best relationship among Universe,Stars and Sun .As shown in given figure .

As we know that ,
Editor, Newspaper and Journalist are different classes to each other .
Therefore , option D represents the best relationship between Editor, Newspaper and Journalist .

According to above given question ,we can say that
Violinists are Instrumentalists and in turn, Instrumentalists are Musicians.
From above it is clear that option ( A ) gives the best relationship between Musicians, Instrumentalists and Violinists .

On the basis of above given question , we can say that
The given information can be represented by the following diagram:
Hence , option ( A ) represents the best relationship between law, music and dance .

From above the given question , it is clear that
Popular English Teachers form sub-set of English Teachers. Also, there may be some English Teachers who are not popular.
Hence , Option B represents the required answer .

According to above given question , we can say that
Some hygroscopic substances may be crystalline and vice-versa.
Some hygroscopic substances may be non-electrolytic and vice-versa.
Some crystalline substances may be non-electrolytic and vice-versa.
From above it is clear that option ( D ) gives the best relationship between hygroscopic, crystalline and non-electrolytic substance.

As per the given above question , we can say that
Here , U = Unemployed;
T = Teacher
Educated people may be employed or unemployed.
From above it is clear that option ( B ) represents the best relationship between educated people, unemployed and teachers .