Four good friends met for a month of wild life experience in the remote island, and then they had the following dialogue on the event: A: none of us persisted for a month; B: some of us persisted for a month; C: B At least one person in He Ding has not persisted for one month; Ding: I have not persisted for one month. If two of the four people are telling the truth and two are telling lies, Which of the following is true:. ['The truth is Jia Heding.', 'The truth is B and C.', 'The truth is A and C.', 'The truth is that B and D.']