(iv) Neil Armstrong
(i) Buzz Aldrin was one of the first people on the moon, but was not the first.
(ii) This is a distractor, as Lance Armstrong has the same last name as Neil, but Lance was a professional road racing cyclist.
(iii) This is another distractor, as it similar to Buzz Aldrin but is in fact the name of a character from the movie Toy Story.
(iv) This is the correct answer. Neil Armstrong was the first man recorded to have walked on the moon.