A) Neil Armstrong was a NASA astronaut most famous for being the first
A) Neil Armstrong was a NASA astronaut most famous for being the first person to walk on the moon, on July 20, 1969.
B) An accomplished test pilot, Armstrong also flew on the Gemini 8 mission in 1966.
C) He retired from NASA in 1971 and remained active in the aerospace community, although he chose to keep mostly out of the public spotlight.
D) Armstrong died on Aug. 25, 2012, at age 82.
Right Answer is: A
Sentence A tells us about the subject i.e. Neil Armstrong being the first person to walk on the moon. Sentence A should be followed by sentence B as it explains the past endeavors of Neil Armstrong. Sentence C tells us about when Neil Armstrong retires from NASA so it will follow sentence B. Sentence D tells us about the death of Neil Armstrong, so it will clearly be the last sentence. Hence, the correct answer is option A i.e. ABCD.