Logical Venn Diagram in Detail - Verbal Reasoning

Problems with Solutions:
Direction(Question 1 to 5): Each of the question below contains three elements these three may or may not have some linkage. Each group of the elements may fit into one of the diagram at (a), (b), (c), (d) and (e). You have to indicate groups letter indicating the diagram is the answer.
Q.1. Square, Rectangle, Polygon

Ans . A
Q.2. Bus, Car, Vehicle

Ans . B
Q.3. Anxiety, Intelligence, Strength

Ans . C
Q.4. House, Bedroom, Bathroom

Ans . B
Q.5. Mustard, Barley, Potato.

Ans . C