land on the Moon orbit a planet return to Earth walk in space
I gave my students this multiple choice question: The Apollo 11 mission was able to retrieve samples of the Moon's surface because it was the first mission to have astronauts

Only one answer is correct among these 4 choices:
- land on the Moon
- orbit a planet
- return to Earth
- walk in space

Could you tell me which one is correct?

land on the Moon