You Put a Solution of Sucrose into a Bag of Dialysis

You put a solution of sucrose into a bag of dialysis tubing, which is permeable to water but not to sucrose.You then put this bag into a beaker of water.An hour later, you observe that the bag has swelled due to

A) the high osmolarity of the surrounding water.
B) passive transport of sucrose molecules.
C) the osmotic pressure of the sucrose solution.
D) the pressure exerted on the bag by the surrounding water.