Read the following passages and answer the items that follow each passage. Your answers to these items should be based on the passages only. We started pitching the highest camp that has ever been made. Everything took five times as long as it would have taken in a place where there was enough air to breathe; but at last we got the tent up, and when we crawled in, it was not too bad. There was only a light wind, and inside it was not too cold for us to take off our gloves. At night most climbers take off their boots; but I prefer to keep them on. Hillary, on the other hand, took his off and laid them next to his sleeping bag. What does the expression "pitching the highest camp" imply?

The correct answer is C. Explanation: The phrase "pitching the highest camp that has ever been made" directly implies that the current location where they are setting up camp is at an altitude higher than any previous camp established by climbers. If they are at an unprecedented altitude for a camp, it logically follows that no one has climbed to or beyond that specific height before. Analyzing the options: A) They reached the summit of the highest mountain in the world - The passage only mentions pitching a camp, not reaching a summit, nor does it specify it's the highest mountain in the world. B) Those who climbed that far earlier did not pitch any camp - The phrase means this camp is *higher* than any previous camp, not that no previous camps were pitched at all. It suggests previous camps were at lower altitudes. C) So far nobody has ever climbed that high - If they are pitching the highest camp ever made, it means they are at an altitude where no camp has been established before, thus no one has climbed to this specific height to establish a camp. This is a direct logical inference. D) They were too many climbers and needed to pitch a big camp - The passage refers to "the highest camp," not necessarily a "big camp," and provides no information about the number of climbers.