A cell membrane does not allow the movement of sodium or chloride ions across it when it is placed in a solution of 0.20 molar NaCl at 20 °C. The cell's volume does NOT change. This means that the osmolality of the interior of the cell must be:
A) 0.10 osmolal
B) 0.40 osmolal
C) cannot be determined without knowing the volume of the cell
