The answer s b Read the excerpts from Team Moon and the NASA article.

If they aborted, it they flung themselves away from the moon (never to land), they would be slung into lunar orbit, where they would meet up with Mike Collins in the command module and head home to Earth.

Three days later the crew is in lunar orbit. A day after that, Armstrong and Aldrin climb into the lunar module Eagle and begin the descent, while Collins orbits in the command module Columbia.

A reader can best combine the information in the excerpts to

understand that the Apollo 11 spacecraft was manned by a crew of only two astronauts with the last names Armstrong and Aldrin.
understand that the Apollo 11 crew member Collins stays in orbit around the moon as a safety measure while Armstrong and Aldrin try to land.
understand that the Apollo 11 crew was prepared for and capable of calling off the moon landing if they felt that they needed to for any reason.
understand that the Apollo 11 crew members climbed into two separate space modules one day after entering into orbit around the moon.