Two Similar-Sized Animal Cells Are Placed in a 0

Two similar-sized animal cells are placed in a 0.5% sucrose solution. Cell A enlarges for a while and then stops; cell B continues to enlarge and finally ruptures. Which of the following must have been TRUE at the beginning of the experiment?

A) Cell A was hypotonic to the solution, and cell B was hypertonic.
B) Cell A was hypertonic to the solution, and cell B was hypotonic.
C) Cell A was hypertonic to cell B.
D) Cell B was hypertonic to cell A.
E) Cells A and B were isotonic to each other.