The correct option is A Do not actively control the osmotic condition of their body fluid so are stenohaline
Osmoconformers are marine animals, which maintain the osmolarity of their body fluids, such that it is always equal to the surrounding seawater. Osmoconformers decrease the net flux of water into or out of their bodies from diffusion. They maintain internal solute concentrations within their bodies at a level equal to the osmolarity of the surrounding medium. They do not need to expend as much energy as the osmoregulators to regulate the ion gradient. Hence, the correct answer is the option A.