Analogy — Tool and function: Knife : Cut :: ? : Guard Select the object whose primary function relates to “Guard” as a knife’s function relates to “Cut”.

Introduction / Context:
The first pair connects a tool to its primary function/effect: a knife is used to cut. We must choose an object whose function is “to guard/protect”.

Given Data / Assumptions:

• Knife → Cut (tool → function).
• ? → Guard (object → function).
• Options mix verbs and nouns; we need a noun (object/tool) parallel to “Knife”.

Concept / Approach:
Maintain “instrument : typical action”. The instrument that guards/protects is a “Shield”.

Step-by-Step Solution:

Verification / Alternative check:
Common pair lists include “Shield : Protect/Guard”.

Why Other Options Are Wrong:

• Dig/Bore: Verbs, not instruments; break symmetry.
• Oar: Instrument, but its function is to row/propel, not guard.
• None of these: Invalid since “Shield” fits.

Common Pitfalls:
Overlooking part-of-speech alignment; the analogy pairs a noun tool with its verb function.

Final Answer:
Shield