The Protein Miraculin, Which Is Found in Taste-Altering "Miracle Berries

The protein miraculin, which is found in taste-altering "miracle berries", causes acidic foods like citrus fruits, soda, and vinegar to taste like candy. Which of the following is the most likely mechanism for the effects of miraculin?

A) Miraculin inactivates sweet receptors, so only sour receptors will detect sweet compounds.
B) Miraculin amplifies umami receptors, enhancing umami flavors.
C) Miraculin alters sweet receptors on the tongue and causes them to perceive carbohydrates as sour.
D) Miraculin alters sour receptors on the tongue and causes them to perceive acids as sweet.