C. Water.
Because it is a chemical composition of two elements, Hydrogen and Oxygen elements.
I think the anwer is electrolyte :)... i had it on a test a couple days ago.
They do not change the nature of the substance unless a chemical change occurs along with the physical change. These may be irreversible, but the result is still composed of the same molecules. When you cut your hair, that is a physical change, even though you can't put the hair back on your head again