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Which of the following statements best summarizes the passage?

A.
Shackleton's recollections of the Antarctic expedition include descriptions of the men's diet and sleeping conditions.
B.
Shackleton records the traits explorers must have to face extreme conditions: courage and endurance.
C.
Shackleton effectively portrays the isolation of his team, far from help on the ice floes.
D.
Shackleton's description of the Antarctic expedition conveys the challenging conditions of the environment: bitter cold, dangerous ice, and unpredictable weather.