Answer:
The right answer to this question is: sente of taste and smell.
Step-by-step explanation:
This can be said just looking at the question, it mentions peppermint candy, and this type of candy almost always has a strong smell, and it's very good aswell.
After knowing this, she just put the candy close to the baby's face, not touching it, not making any different noises, and the baby can or cannot realize that is a candy, the possibility exists, but it's higher to be the sense of taste and smell.