A. B, C, and D discuss the completion of homework by classmates. A says: All students in the class have finished their homework. B says: If Xiao Li finishes the homework, then Xiao Zhao does not finish the homework. C Said: Xiao Li finished his homework. Ding said: Someone in the class didn't finish their homework. Knowing that only one of the four people is wrong, which of the following can be introduced? ['A is wrong, Xiao Zhao did not finish his homework.', 'B is not right, Xiao Li has finished his homework.', 'C is wrong, Xiao Zhao did not finish his homework.', 'Ding was wrong, Xiao Zhao finished his homework.']