According to the meaning of the metal activity sequence table, we can know that: (1)Y+H 2 SO 4 ═YSO 4 +H 2 ↑, indicating that Y is ahead of hydrogen in the sequence table, that is, before H; ? (2)X does not react with ZSO _ 4, indicating that Z > X；; (3)Z+H 2 SO 4 does not react, indicating that Z is behind hydrogen; Based on the above analysis, we can know that the order of XYZ activity from strong to weak is: y > z > x；;

So choose C.