Jen is jogging in a park when she finds a stray dog. She puts up signs looking for the dogs owner. Mark notices the sign while out looking for his missing dog and calls Jen. When Mark picks up his dog from Jen, he offers her $200 for finding his dog and keeping the dog safe. Jen turns down the money. Three days later, Jens car breaks down and the repairs will be costly. Jen calls Mark and request the $200 he had offered. Mark refuses to pay the money. Jen sues for breach of contract. How should the court rule?