Classification — mixed relations: choose the pair that uniquely shows “item : location,” unlike the others.

Introduction / Context:
Two pairs are co-hyponyms (same-level items), one is member→group, and one is item→location. The unique relation must be isolated.

Given Data / Assumptions:

• Rice : Corn → two cereals (co-hyponyms).
• Tomato : Potato → two common vegetables/tubers (co-hyponyms in usage).
• Student : Class → member → group.
• Book : Library → item → location.

Concept / Approach:
Among the non co-hyponym pairs, decide which is unique. Member→group is frequent in reasoning sets; “item→location” is distinct here and appears only once.

Step-by-Step Solution:

Verification / Alternative check:
Paraphrase: “Both are types of ___” fits A, B; “belongs to” fits C; “kept in” fits D only.

Why Other Options Are Wrong:
They align with duplicated relation types.

Common Pitfalls:
Picking C because it differs from A/B; the goal is to find the single relation unmatched by any other choice.

Final Answer:
Book : Library