The answer is C
In this question the solution prepared in the lab has a lower concentration of salt. This means that the concentration of water is higher outside the cell than it is inside the cell.
The difference in osmotic pressure means that water will move into the cells.
This video gives more explanation of hypotonic and hypertonic solutions and discusses reasons why water may enter or leave cells.
This video shows the changes that occur in red onion cells when they are placed in pure water and salt water solutions.
Hope this helps!