You and your friends have just stepped off the plane in Cusco, Peru (11,200 ft). Your friends are so eager to see Machu Picchu they want to start off hiking the Inca Trail right away and not waste any time. How do you respond?
A. "Sounds good, but we had better bring our warmest clothes."
B. "Sounds good, but we had better pack extra water."
C. "No problem -- we had the whole plane ride to acclimatize to the high altitude."
D. "Waiting a few days might be smart, since it takes time to acclimate to high altitude."
Answer: D
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