Select the set of classes whose relationship is best illustrated by the following diagram.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Extroverts, Men, Handsome
The diagram shows three circles that all overlap one another, with a common region. The classes must therefore share members two at a time and all three together, while each also has members of its own.
Option (1) Doctors, Fathers, Sisters — no father is a sister, so these two circles must stay apart.
Option (2) Stationery, Stapler, Eraser — staplers and erasers are both stationery, so their circles lie inside the circle of stationery.
Option (3) Extroverts, Men, Handsome — some men are extroverts, some extroverts are handsome, some men are handsome, and one man can be all three, so the three circles cross one another as in the diagram.
Option (4) Bureaucrats, Men, Women — no man is a woman, so these two circles must stay apart.
