Which of the following compounds is amphoteric when placed in water? We know that water itself is a prime example of an apothecary species. It's not present here, so fall back on our other definition. For an amphoteric species, they begin with a hydrogen and they possess a negative charge at the end.

If we take a look, which choice fits this description? If we take a look, the answer has to be option C because with option C we have a hydrogen at the beginning and we have a negative charge at the end. Here this represents bisulfite ion or hydrogen sulfide ion. It's an apoteric species.

Based on what's around it, it could behave as an acid or a base. So in this particular question we have option C as our final answer.