A new study shows that sweet-taste-producing proteins that are present on the tongue are also present in the gut. Researchers have speculated that the gut can also taste candy. The person in charge of the study said: In fact, the way the gut tastes the same as the tongue. ". Which of the following best supports the above speculation? ['As long as you have this substance that detects sweet proteins, you can taste sweet.', 'In addition to sweetness, the intestines can also taste sour.', 'In addition to the intestine, there are other organs that can taste sweet.', 'Taste can be expressed through other feelings.']