We can say that
Both Day and week belong to year . Year represents the biggest circle ,Day represents the smallest circle , and week represents the middle circle .As shown in figure .

Correct Option: A

As we know that
Both Day and week belong to year .Year represents the biggest circle ,Day represents the smallest circle , and week represents the middle circle .As shown in figure .
From above it is clear that required answer is option ( A ) .

According to above given question , we know that
Men are different from women.

Correct Option: C

According to above given question , we know that
Men are different from women.
Hence , option ( C ) gives the best relationship between men, women and pregnant women .

According to above given question , we can say that
Boys are different from girls.
But both come under the class children.

Correct Option: C

According to above given question , we can say that
Boys are different from girls.
But both come under the class children.
From above it is clear that option ( C ) represents the best relationship between Boys, Girls and Children . As shown in given venn - diagram .

On the basis of above given question , we can say that
Brinjal is a Vegetable but Meat is different from the both.

Correct Option: C

On the basis of above given question , we can say that
Brinjal is a Vegetable but Meat is different from the both.
As shown in figure , option ( C ) represents the best relationship between Brinjal, Meat and Vegetables .

As we know that ,
Every thing is composed of molecules.
Sun is different from Moon.

Correct Option: C

As we know that ,
Every thing is composed of molecules.
Sun is different from Moon.
From above it is clear that option ( C ) represents the best relationship between Sun, Moon and Molecule. As shown in given venn - diagram .