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Option 3: "He became the first pilot to break the sound barrier."
Explanation: This option is correct because the text explicitly states that in 1947, Chuck Yeager broke the sound barrier, marking a significant achievement in aviation history.
Option 1: "He was the first pilot to fly into space."
Explanation: This option is incorrect because the text does not mention Chuck Yeager flying into space. Instead, it highlights his achievement of breaking the sound barrier in 1947, which is a different milestone.
Option 2: "He designed the EX1 experimental aircraft."
Explanation: This option is incorrect as the text states that Chuck Yeager hopped aboard the EX1, but it does not indicate that he designed it. The focus is on his flight and achievement rather than the design of the aircraft.
Option 4: "He set a new altitude record for manned flight."
Explanation: This option is incorrect because the text does not mention Yeager setting an altitude record. It focuses on his breaking of the sound barrier and the subsequent developments in experimental flight.
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