am i over thinking this question?

Joey and Kate are classmates. While waiting for class to start one day, Joey told Kate he was thinking about selling his laptop and buying a new one. The next day, October 15, Kate sent Joey an ANGEL email offering to buy his laptop for $100. On October 16, Kate had second thoughts about buying a used laptop, so she emailed Joey again and revoked her offer to buy it. On October 17, Kate saw Joey in class and told him that she was revoking her offer. On October 18, Kate learned that Joey has sold his laptop to Brendan. On October 19, Joey finally got around to logging on to ANGEL and reading his homework assignments and Kate's emails. Kate's offer to buy Joey's laptop terminated on: