Biology

The correct answer is: A.hypertonic

A solution is considered hypertonic when it has a lower concentration of water (or a higher concentration of solutes) compared to the inside of the cell. In this case, the cell is 90% water, so it has a high concentration of water, while the solution outside the cell contains only 10% water, meaning it has a lower concentration of water.

When a cell is placed in a hyper...