The following question contains three elements. These elements may or may not…

Concept: To choose the diagram that best fits three classes, first work out each pair's real relationship — completely separate (no members in common), one wholly contained inside the other (every member of one is also a member of the other), or partly overlapping (some, not all, members in common) — then match the single diagram whose circles reproduce that exact pattern for every pair at once.

Application: Work out each pair among Bulb, Lamp and Light one at a time:

1. Bulb and Lamp: a bulb and a lamp are two different physical devices — no bulb is a lamp and no lamp is a bulb — so these two share no members and must be drawn as two circles that never touch.

2. Bulb and Light: light is exactly what a bulb gives off, so every bulb belongs inside the class of things that produce light — the Bulb circle sits wholly inside the Light circle.

3. Lamp and Light: by the same reasoning, every lamp also gives off light, so the Lamp circle too sits wholly inside the Light circle.

Putting it together: So Bulb and Lamp must be drawn as two separate circles that never touch each other, and both of those circles must sit completely inside one larger circle representing Light. That is a single large circle enclosing two separate smaller circles — not a chain of circles overlapping a middle one, not one small circle nested inside a nested pair with a third kept apart, and not a strict three-level nest of all three circles.

Contrast: Checking the other patterns against this:

• A diagram with three circles kept completely apart from one another treats Light as sharing nothing with either device — but light is precisely the output both a bulb and a lamp produce, so this pattern misses that shared link entirely.

• A diagram with one circle placed fully inside a second circle, and a third circle kept entirely apart from both, forces one of the two devices into an is-a relationship with the other — but a bulb is not a type of lamp, nor a lamp a type of bulb, so no such direct containment exists between the two devices themselves.

• A diagram with three circles nested strictly one inside the next, like rings inside rings, demands that one device be fully contained inside the other device, which is itself inside light — again wrongly making one device a subset of the other device, rather than both being separate subsets of light.

Answer: So the correct diagram is the one showing Bulb and Lamp as two separate, non-overlapping circles, both drawn completely inside one larger circle standing for Light.