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I'm doing some LR drilling right now, and I just wanted to make a discussion post and share my reasoning for a question (as prompted by 7Sage).
C: the glacier that melted to reveal the ancient body is at least 4,000 years old
Reasoning: Artifacts found on the man's body indicate that he lived at least 4,000 years ago, and that he died on the same spot where his body was discovered. Therefore, the glacier - the spot on which he died and was discovered - must be at least 4,000 years old. None of the other answer choices were even close to enticing and were easily eliminated.
Admin Note: Edited title. Please use the format: "PT#.S#.Q# - brief description of the question"