A. B, and C, one from Shandong, one from Henan, and one from Hubei. Now I only know that: C is older than Hubei, A and Henan are not the same age, and Henan is younger than B. It can be inferred from this:. ['A is not from Hubei.', 'Henanns are younger than A.', 'Henanns are older than Shandong.', 'Hubei people are the youngest.']