Complete the sentence about Cho Oyu with the correct year: Until the ascent of Mount Everest by Reinhold Messner and Peter Habeler in ______, this was the highest peak climbed without supplemental oxygen.

Answer and explanation

Correct answer: C. 1978

Until the ascent of Mount Everest by Reinhold Messner and Peter Habeler in 1978, this was the highest mountain climbed without oxygen.

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