Answer: $0
Step-by-step explanation:
According to the internal revenue code, it should be noted that under 102(a), in the gross income, the cake if a property that's being acquired by gift isn't included.
Therefore, in this scenario, Carol received a gift of stock from her favorite uncle. The stock had a fair market value of $30,000 and a basis to the uncle of $10,000 at the date of the gift, then Carol isn't liable to pay any tax on the gift.