When an animal cell is placed in a hypotonic solution, . it will gain water and may burst
it will lose water and shrink
the cell's reaction cannot be determined
it will remain the same size

It will gain water and may burst

Explanation:

It is due to increase in the amount of water in the cell which exerts high pressure on the the cell membrane.

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

the answer is b.) hydrogen bonds between bases.