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A
Were not prepared for the trip
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B
Needed warmth and shelter for the night
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C
Planned to hike back down immediately
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D
Were lost
Why this is the answer
INFERENCE: The passage doesn't state directly that the hikers needed warmth and shelter, but it can be INFERRED — they set up tents and started a fire after dark as the temperature dropped, indicating they needed warmth and shelter for the night. ASVAB strategy: inference questions require reading 'between the lines' using clues. The actions (tents, fire, cold, nightfall) logically imply preparing to stay warm overnight. The passage gives no evidence they were unprepared or lost.
Source: ASVAB Paragraph Comprehension — Inference