The second civilian astronaut who flew on Apollo 7 was Walter Cunningham
Answer: Option (a)
Explanation:
Apollo 7 mission was proposed in October 1968 and this was the first mission to carry crew(members) to the space.
This mission consists of 3 crew members,
Lunar module pilot was the sole survivor in that mission. Apollo 7 mission lasted for nearly 21 months and it fulfills the drawback of Apollo 1 mission.