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(C) The contractile vacuole is an organelle primarily involved in osmoregulation,specifically in expelling excess water from the cell.In freshwater en

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Both $(A)$ and $(B)$

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(C) The contractile vacuole is an organelle primarily involved in osmoregulation,specifically in expelling excess water from the cell.In freshwater environments,the concentration of solutes inside the cell is higher than in the surrounding water,leading to a constant influx of water via osmosis. Therefore,freshwater protozoans require contractile vacuoles to prevent cell lysis.In contrast,marine environments are isotonic or hypertonic to the cell,so there is no significant influx of water,making contractile vacuoles unnecessary.Similarly,parasitic protozoans live in an isotonic environment (the host's body fluids),so they also do not require contractile vacuoles for osmoregulation.Thus,contractile vacuoles are generally absent in both marine and parasitic protozoans.

Contractile vacuole is generally absent in the

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