(b) Donnas pet dog, Flash, is missing. On March 20, she puts up posters in her neighbourhood offering a reward of $1,000 for Flashs return by March 25. She also advertises the reward for its return in the local newspaper. On March 23, Donna decides that she does not want Flash anymore. On the next day, she publishes an advertisement in the newspaper withdrawing the reward. Evan finds Flash that same day and sends an e-mail to Donna claiming the reward and informing her she can collect Flash from his house. Donna opens the e-mail on March 26. Is Evan entitled to the reward? Support your answer with reference to case law. [15 marks]