Which of the following diagrams indicates the best relation between Oil, Wick…

Concept: In a three-term classification Venn diagram, the shapes must mirror the real relationship: nest one circle fully inside another only when that term is a subset of it, overlap two circles only when the terms share common elements, and keep circles fully separate only when the terms are unrelated. When two terms are both parts of a third term but are distinct from each other, the correct diagram draws the two as separate, non-overlapping circles placed fully inside the circle for the third term.

Application: Oil and Wick are both components used inside a Lamp, so both circles must sit fully inside the Lamp circle. At the same time, Oil is not Wick and neither is a subset of the other, so their two circles must not touch or overlap. The diagram with two separate circles enclosed inside one larger circle captures both facts at once.

Contrast with the other diagrams:

• Three fully separate circles would mean Oil, Wick and Lamp share no relationship at all — but Oil and Wick are both parts of a Lamp, so this is too weak a relationship.

• Three circles each overlapping its neighbour would mean every pair of terms shares common elements — but Oil and Wick do not overlap in meaning with each other, only each is a part of Lamp.

• One circle nested inside another with a third separate circle would mean one term is a strict subset of another while the third term is completely unrelated — that does not fit two distinct components both belonging inside one container term.