across a permeable membrane that separates solutions of the same concentration across a permeable membrane that separates solutions of different concentrations across a nonpermeable membrane that separates solutions of the same concentration across a nonpermeable membrane that separates solutions of different concentrations
I gave my students this multiple choice question: In which situation would osmosis most likely occur in cells?

Only one answer is correct among these 4 choices:
- across a permeable membrane that separates solutions of the same concentration
- across a permeable membrane that separates solutions of different concentrations
- across a nonpermeable membrane that separates solutions of the same concentration
- across a nonpermeable membrane that separates solutions of different concentrations

Could you tell me which one is correct?

across a permeable membrane that separates solutions of different concentrations