请选择DCBA)z9i2a6d — _______ does your father do?6I5A'a1W3|6J7e0_8|8v+]
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A．Who6I5A'a1W3|6J7e0_8|8v+]
B．What6I5A'a1W3|6J7e0_8|8v+]
C．Which6I5A'a1W3|6J7e0_8|8v+]
D．How old6I5A'a1W3|6J7e0_8|8v+]