Which of the following diagrams indicates the best relation between Mercury,…

Concept: In a classification Venn diagram, when two specific items (here, Mercury and Zinc) are both instances of one broader category (here, Metal), and the two items are mutually exclusive of each other, the diagram must show two separate, non-overlapping circles, each fully contained inside a larger circle representing the broader category.

Application: Mercury and Zinc are both classified as metals, so each of their circles must lie completely inside the Metal circle. However, no substance is simultaneously Mercury and Zinc, so the two circles must not intersect or touch each other.

Contrast with the other diagrams:

• A smaller circle overlapping a larger circle wrongly shows Mercury and Zinc sharing common members, which cannot happen since they are distinct elements.

• Three separate, unconnected circles wrongly treat Metal as unrelated to Mercury and Zinc, when both are in fact metals.

• Three concentric circles wrongly nest one of Mercury or Zinc strictly inside the other, when the two are siblings under Metal, not one contained in the other.

Result: The diagram with two separate circles fully enclosed within one larger circle correctly represents the relation between Mercury, Zinc and Metal.