please help with questions 13,15,16. Thank you

13. A U.S. senator makes an intentionally false allegation of treason against a nationally famous celebrity at a nationally televised Senate hearing about Russian interference in presidential politics. At the time the senator makes the statement, the senator knows that it is false. The celebrity loses her job as a result of the senator's false accusation. Can the celebrity prevail in a lawsuit against the senator for defamation? Explain why or why not.15. Frank is a merchant. He offers to purchase 500 cases of Cherry Coke and 500 cases of Budweiser from Adam for a Christmas party that Frank is holding on December 12. Adam is also a merchant. Adam accepts Frank's offer. Performance is due on December 9. On December 9, a truck arrives at Frank's place with 500 cases of Budweiser and 400 cases of Diet Sprite. What rule allows Frank to reject the Diet Sprite's while accepting the Budweiser's. 16. Assume that Frank, after rejecting the diet Sprite portion of Adam's December 9 shipment, went online on December 10 and placed an order with a Chicago company called Next Day Soda. Next Day specialized in shipping large amounts of soda overnight, but it charges a premium - double the price that Adam had contracted for with Frank -- to do so. Frank orders and receives 500 cases of Cherry Coke from Next Day in time for the Christmas party. Frank asks Adam to pay him the difference between the cost of the original contract and the cost of the contract with Next Day. Adam refuses. Frank sues, demanding that Adam cover the extra cost that Frank paid for the beer. Will Frank win? Explain why or why not