次の会話を読んで、問題に対する適切な答を①～④から選びなさい。
A: Perhaps I should remind you, Jack, that it is company policy to travel economy class.
B: What if the economy section full?
A: Then wait for another flight.
問題
What is the employer angry about?
①Jack was away from the office too much.
②Jack bought a first class ticket.
③Jack missed his flight.
④Jack kept him waiting.