they have less mass on the moon. their density decreases on the moon. the moon has less gravity than Earth. the moon has less friction than Earth.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Astronauts weigh more on Earth than they do on the moon because
Possibilities:
- they have less mass on the moon.
- their density decreases on the moon.
- the moon has less gravity than Earth.
- the moon has less friction than Earth.

the moon has less gravity than Earth.