Robinson Crusoe tells the story of a shipwreck and solitary survival.

The difference between mountain climbing and shipwreck diving lies in ______. A: the amount of oxygen B: the atmospheric pressure C: the breathing rate D: the damaging degree of the human nervous system

By saying "The Andrea Doria is known as the 'Mt. Everest of diving'", the author means that ______. A: the Andrea Doria is as intimidating as Mt. Everest B: shipwreck diving is both appealing and dangerous C: it is extremely challenging to dive to the Andrea Doria D: the depth of the Andrea Doria equals the height of Mt. Everest