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