A. B, C, D, and P. The five people traveled by high-speed rail, and they were sitting in five seats A. B, C, D, and F in the same row. Known: (1) If one of A or B is sitting in Block C, then C is sitting in Block B; (2) If Peng is sitting in Block C, then D is sitting in Block F. If Ding sits in Block B, then it is certain that:. ['A sits in Block A.', 'B sits in Block D.', 'C sits in Block C.', 'E sits in Block F.']