Mike promises that next year he will sell Valeria a certain house. Meanwhile, he allows her to live in the house. Valeria completely renovates the house, repairs the heating system, and entirely landscapes the property. The next year, Mike tells Valeria he’s decided to keep the house. Who is entitled to the house?

a. Valeria under the doctrine of promissory estoppel.

b. Valeria because Mike’s decision to keep the house is an unforeseen difficulty.

c. Mike because his promise to sell Valeria the house was illusory.

d. Mike because he initially stated only his intention to sell.