Cell shrinking, also known as crenation, occurs when a cell is placed into a solution.
a) isotonic
b) exergonic
c) hypertonic
d) hypotonic

When a cell is placed into a hypertonic solution, cell shrinks which is also known as Crenation.  

Option C

Explanation:

Crenation refers to shrinking of the cells. When the cell is placed in the hypertonic solution in which the concentration of solutes is less inside the cell when compared to the outside of the cell. Due to this reason the water present in the cytoplasm of the cell moves out to the environment by process called as osmosis.  

As the water moves out, the cytoplasm shrinks which in turn causes formation of crack like structure and thus leads to crenation of the cells.

activation of phospholipase c (plc) indirectly increases intracellular ions through inositol triphosphate (ip3).