because the conversion transforms solids to liquids because the conversion allows for less glucose in the liver because the conversion changes one substance to a new one because the conversion changes the shape of the liver cells
I gave my students this multiple choice question: The liver converts glucose to glycogen for storage. Why is this function considered a chemical change?

Only one answer is correct among these 4 choices:
- because the conversion transforms solids to liquids
- because the conversion allows for less glucose in the liver
- because the conversion changes one substance to a new one
- because the conversion changes the shape of the liver cells

Could you tell me which one is correct?

because the conversion changes one substance to a new one