After investigating and analyzing five friends of a victim, each of the four police officers made the following speculations: A said: "These five people are suspected. " B said: "Lao Chen cannot escape the relationship, he is suspected. "C said," Not all of these five people are suspect. "Ding said," Some of the five must-have committed a crime. ". If only one of four people guessed correctly, which of the following is true? ['A guess is correct, Lao Chen is most suspect.', 'C speculates correctly, Lao Chen is not suspect.', 'C speculates correctly, but Lao Chen may commit the crime.', "Ding's guess is correct, Lao Chen is suspect."]