A university actively guided college students to carry out summer social practice activities, and achieved remarkable results. The school and a township jointly selected two students with excellent academic performance to serve as village officials in the township. After multiple assessments, A. B, C, and Ding Discuss the possibility of candidates together: A says: "I won't be selected. " B says: "If I are selected, then C will be selected. " C says: "If B is selected, D will be selected. " D said: "B Will be selected but C will not be selected. ". If only one of the four guesses is correct, which of the following judgments must be true? ? ['A and B will be selected.', 'A. Ding will be selected.', 'B, C will be selected.', 'B, Ding will be selected.']