Correct Option (C)
The expression ‘pitching the highest camp’ implies that the expedition established a campsite at an altitude previously unattained by any human endeavor. This signifies a new record for the highest elevation at which a camp had been set up, rather than reaching the mountain's summit.
Incorrect Options:
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Option 1: The text refers to "pitching the highest camp," which is an activity distinct from reaching the summit. Camps are typically established at various points during an ascent, often below the final summit push. Therefore, this option misinterprets the action described.
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Option 2: While the camp was the highest ever made, the passage does not provide information to suggest that earlier climbers who reached similar altitudes failed to pitch any camps. The emphasis is on the unprecedented altitude of this specific camp, not on the absence of camps by others.
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Option 4: The passage contains no information regarding the number of climbers or the size of the camp. The difficulties described are attributed to the extreme altitude and thin air, not to accommodating a large group or requiring an exceptionally big camp.