the mass of the sample the density of the sample whether the sample has a fixed shape whether the sample conducts electricity
I gave my students this multiple choice question: A sample of an unknown substance has a volume that is independent of its container. Which additional information is needed to determine the state of the sample?

Only one answer is correct among these 4 choices:
- the mass of the sample
- the density of the sample
- whether the sample has a fixed shape
- whether the sample conducts electricity

Could you tell me which one is correct?

whether the sample has a fixed shape