Interpret the membership pattern: “Class : School : Student”. Choose the option that best mirrors “member(s)/subgroup : larger group : member(s)”.

Introduction / Context:
Relational analogies can represent hierarchical membership. A “class” is a defined subgroup within a “school”, and a “student” is a member of the school community. We want a triad that similarly presents “member(s)/subgroup : larger collective : member(s)”. The best human-social parallel is “Sister : Family : Brother”.

Given Data / Assumptions:
We treat both “class” and “student” as members within the school structure, one collective (class) and one individual (student).

Concept / Approach:
Prefer a triad where the middle is the higher-level collective and the flankers are elements within it. “Sister : Family : Brother” fits perfectly: family is the collective; sister and brother are members. The structural mapping matches the school case closely in terms of membership logic.

Step-by-Step Solution:

Verification / Alternative check:
“Hand : Body : Finger” is anatomical part–whole; not a social membership relation. “Leaf : Tree : Root” is also part–whole, not member–group. The ball/bat/pitch set mixes unrelated game elements without a clear collective membership structure.

Why Other Options Are Wrong:
They express part–whole or mixed relations rather than membership in a collective.

Common Pitfalls:
Confusing anatomical part–whole with social membership hierarchies.

Final Answer:
Sister : Family : Brother