单项选择题

Which of the following are bases for ?

A.(1,2,0) and (0,1,-1)
B.(1,1,-1),  (2,3,4),  (4,1,-1),  (0,1,-1).
C.(1,2,2), (-1,2,1), (0,8,0)
D.(1,2,2), (-1,2,1), (0,8,6)
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