Analogy — “Swimming : River :: Hiking : ?”. Choose the typical terrain for the activity.

Introduction / Context:
This analogy pairs an activity with a typical natural setting. Swimming commonly occurs in a river; hiking is typically associated with mountains (or trails in mountainous regions). Choose the closest canonical terrain.

Given Data / Assumptions:

• Map activity → usual outdoor setting.
• Prefer classic pairings used in reasoning questions.

Concept / Approach:
Hiking is strongly associated with mountains and hilly trails.

Step-by-Step Solution:

Verification / Alternative check:
While “trail” is also relevant, the given stem uses a natural feature (river). “Mountain” best mirrors that pattern.

Why Other Options Are Wrong:

Common Pitfalls:
Choosing any outdoor word rather than the iconic terrain for hiking.

Final Answer:
Mountain