Answer:
It pumps water out of the cell; as water enters the organism's cells via osmosis (diffusion of water), the contractile vacuole acts very much like a pump to allow water to exit the organism; without it the organism would die. Also, homeostasis is maintained in this manner; all it means is a condition of stability.
The contractile vacuole in a single-celled organism's function for maintaining homeostasis should be by pumping water out of the cell.
It should pump the water out of the cell since the water should enter the cell of the organism by the diffusion of water. The contractile vacuole should act very much such as pumping for permitting water for existing the organism and without it, the organism could die. Also, at the same time, homeostasis should be maintained in that way where there is the stability condition.
Therefore, the second option is correct.
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