From above given question , we know that
Fishes, Snakes and Birds , all are different from one another.

Correct Option: D

From above given question , we know that
Fishes, Snakes and Birds , all are different from one another.
From above it is clear that option ( D ) represents the best relationship between Fishes, Snakes and Birds . As shown in given venn - diagram .

According to above given question, we can say that
Cement is different from wood.
But both are building materials.

Correct Option: B

According to above given question, we can say that
Cement is different from wood.
But both are building materials.
From above it is clear that option ( B ) represents the best relationship between Building material, Cement and Wood . As shown in given venn - diagram .

According to above given question ,we can say that
Dogs come under the class animal.
Some dogs are pets.
Some other than animals are also pets.

Correct Option: C

According to above given question ,we can say that
Dogs come under the class animal.
Some dogs are pets.
Some other than animals are also pets.
Therefore, the correct diagram would be :

From above given diagram , we can say that
The letters b and d are present in both the circles.

Correct Option: B

From above given diagram , we can say that
The letters b and d are present in both the circles.
Therefore , option ( B ) is correct answer .

From above given question , we can say that
All mothers are women.
Some women are mothers.
Some mothers may be engineers.

Correct Option: D

From above given question , we can say that
All mothers are women.
Some women are mothers.
Some mothers may be engineers.
From above it is clear that option ( D ) represents the best relationship between Women, Mothers and Engineers. As shown in given venn - diagram .