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

Passage Two How many passengers on board Andrea Doria were rescued A: All the passengers. B: About 1,650. C: 52. D: Not sure.