the amount of matter in the block the amount of space the block takes up the force of gravity acting on the block the distance between the molecules in the block
I gave my students this multiple choice question: Which of the following best describes the mass of a solid block of ice?

Only one answer is correct among these 4 choices:
- the amount of matter in the block
- the amount of space the block takes up
- the force of gravity acting on the block
- the distance between the molecules in the block

Could you tell me which one is correct?

the amount of matter in the block