During a donation to the snow-stricken area in the south, a charitable organization received an anonymous donation of 10,000 yuan. After investigation, the organization found that it was donated by one of four people: A. B, C, and D. Charity organization members When verifying them, they found that their statements contradicted each other. A said: I'm sorry, this money was not donated by me. B said: I guess this money must be donated by D. C said: B's highest income is definitely donated by B Ding said: B's statement has no basis. Assuming that only one of the four people has spoken the truth, who is the real donor? ['ormer.', '.', '.', 'ing.']