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To answer this question, we have to consider what happens to our cells when they face different amounts of salt or solutes in their surroundings: what happens when the solutes' concentration is equal both inside them and outside them (isotonic), what happens when the solute concentration is higher outside with respect to their inside (hypertonic), and what happens when the solute concentration is lower outside with respect to their inside (hypotonic), so we can use the picture below to see it graphically.
In these pictures, we can see that when the cells of an organism face a hypertonic media (when there are high concentrations of solutes), they dehydrate because of water loss, so they shrink, and when those cells are exposed to low concentrations of solute, with respect to their inside, they absorb water, so they swell.
Having this clear, we can say that if a saltwater animal exposes to higher concentrations of solutes, its cells will shrink or experience plasmolysis, as stated in the third answer option.
