Answer:
3. They did not know how to land.
Explanation:
When they reached the surface of the moon, the astronauts realized that the location was more defective than they expected and what the spacecraft had been programmed to do. Therefore, they had to make the landing in semimanual mode, which was difficult to control, mainly because there was a strong danger of explosion that would take the lives of the crew, but even with the danger and the lack of experience in landing ships in a surface completely irregular, they succeeded.
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