Final answer:
Kathy will likely be successful if she sues the estate because there was consideration for her father's promise.
Step-by-step explanation:
In this case, Kathy agreed to postpone her wedding in exchange for her father's promise to give her $10,000 if she completed her first year of law school. This agreement between Kathy and her father is considered a contract. In a contract, there must be consideration, which is something of value exchanged between the parties. In this case, Kathy's promise to postpone her wedding is the consideration for her father's promise of $10,000.
Therefore, Kathy will likely be successful if she sues the estate because there was consideration for her father's promise. The fact that her father passed away does not terminate the contract or affect Kathy's right to the promised amount.