Why Does Orange Juice Taste Unpleasant Just After One Uses

Why does orange juice taste unpleasant just after one uses toothpaste?

A) Toothpaste contains a chemical that changes certain taste receptors.
B) When the teeth are clean, the acid in the orange juice irritates them.
C) Toothpaste removes a coating that protects the tongue.
D) Toothpaste enhances the binding of molecules to sweetness receptors.