On an international train, passengers A. B, C, and D from the four countries of Britain, Italy, Japan, and Germany happened to be in a certain carriage. Each of them could speak three languages in addition to their own languages. One of them, one language, three people can speak. The situation of these four passengers talking is as follows: (1) B does not speak English, and when A talks with C, he can translate for them; (2) A is Japanese, Ding doesn't speak Japanese, but they can talk without difficulty; (3) B, C, and D cannot find a common language to talk to; (4) Among the four No one can speak both Japanese and Italian. Based on this, what kind of language can all three people speak? ['Japanese.', 'German.', 'English.', 'Italian.']