microscope and balance graduated cylinder and balance microscope and graduated cylinder beaker and graduated cylinder
I gave my students this multiple choice question: Which of the following would be most useful for calculating the density of a rock sample?

Only one answer is correct among these 4 choices:
- microscope and balance
- graduated cylinder and balance
- microscope and graduated cylinder
- beaker and graduated cylinder

Could you tell me which one is correct?

graduated cylinder and balance