only objects that have mass only objects that sink in water only objects that are made of metal only objects that are heavier than air
I gave my students this multiple choice question: What objects are affected by Earth's gravity?

Only one answer is correct among these 4 choices:
- only objects that have mass
- only objects that sink in water
- only objects that are made of metal
- only objects that are heavier than air

Could you tell me which one is correct?

only objects that have mass