Which astronaut is associated with the claim that he was the first man to walk on the Moon in the provided material?

• A. Neil Armstrong
• B. Buzz Aldrin
• C. Michael Collins
• D. Yuri Gagarin

Answer: (A)

The key idea here is identifying who first walked on the Moon. Neil Armstrong is the person associated with that milestone. During Apollo 11 in 1969, he stepped onto the lunar surface first, followed by Buzz Aldrin a short time later, while Michael Collins stayed in orbit around the Moon. Yuri Gagarin, though a pioneer in human spaceflight, was the first person in space, not on the Moon. So the correct association is Neil Armstrong.