Fiona lost her pet dog and told Mary, “If you find my dog and return him to me, I’ll pay you \($200.”\) Mary said nothing in response but found the dog and returned him. Fiona refused to pay because when she’d originally made the offer, Mary did not make any kind of promise to return the dog. Is Fiona correct? Why? What if, instead, Fiona lost her pet dog and said nothing to Mary. Mary found the dog and returned him. Fiona was so grateful that, on reuniting with the dog, she exclaimed, “Mary, in appreciation for finding my dog, I’ll give you a \($200\) reward!” A week later, Fiona refused to pay Mary and claimed that there was no valid contract between them. Is Fiona correct? Why?