The first attempt to climb Everest was made by British climbers George Mallory and Guy Bullock in 1921. The pair did not make it to the top of the mountain, nor did the many who made attempts in the several decades that followed. A strange and ambitious quest occurred in 1933. A British millionaire named Lady Houston funded a mission involving a formation of British aircraft that flew over the peak of Everest. Their plan was to drop the British flag on the summit of the mountain. It was the first flight over Everest, but not the first journey to the peak by foot. The first climbers to summit Everest were New Zealander Edmund Hillary and Tenzing Norgay, a local climber from Nepal. A handful of other climbers made a few more successful summits in the decade that followed. On May 1, 1963, Jim Whittaker was the first American to stand atop Everest and look down at the clouds. Which detail from the excerpt reveals how people from different countries worked together to hike Mount Everest?

A British millionaire named Lady Houston funded a mission involving a formation of British aircraft that flew over the peak of Everest.
On May 1, 1963, Jim Whittaker was the first American to stand atop Everest and look down at the clouds.
The first attempt to climb Everest was made by British climbers George Mallory and Guy Bullock in 1921.
The first climbers to summit Everest were New Zealander Edmund Hillary and Tenzing Norgay, a local climber from Nepal.