A student is asked to explain the osmotic function of the cell membrane using a working model. Which model should the student use? A. A solid rubber ball placed in a beaker containing a concentrated salt solution.

B. An egg in it's shell placed in a beaker containing a concentrated sugar solution.

C. A solid, impermeable plastic ball containing a sugar solution placed in a beaker containing a more concentrated salt solution.

D. A semi-permeable plastic bag filled with a sugar solution placed in a beaker contain a more concentrated sugar solution