Final answer:
Jon Krakauer does not take any physical object from the summit of Mount Everest as a souvenir, opting only to take photographs.
Step-by-step explanation:
The answer to the question 'What does Krakauer take from the summit as a souvenir?' is d) Nothing. Jon Krakauer, the author of Into Thin Air, documents his experience climbing Mount Everest during a deadly season in 1996. In his account, Krakauer describes leaving the summit without taking any physical object as a token or souvenir.
Instead, he only took photographs as a way to remember his achievement. This detail is consistent with the tone of contemplation and respect for the mountain that Krakauer maintains throughout the book.