Difficulty: Easy
Correct Answer: Water
Explanation:
Given data
Concept / Approach
We need a noun that is naturally described as "stagnant." The standard collocation is "stagnant water."
Step-by-step reasoning
"Flow" ↔ "River" (typical property). "Stagnant" ↔ Water (typical property).
Eliminate distractors
Air can be still but "stagnant air" is less canonical in such basic analogies; Wind implies movement (opposite of stagnant); Cloud is not idiomatically called stagnant.
Final Answer
Water
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