单项选择题

(第4章)x=[[1,2,3],[4, 5, 6],[7,8,9]]
y=[[2,2,2],[3, 3, 3],[4,4,4]]
z=[[5,5,5],[6, 6, 6],[7,7,7]]
xyz=[x1-y1-z1 for a,b,c in zip(x, y, z) for x1,y1,z1 in zip(a,b,c)]
print(xyz)
print函数输出的结果是(   )
A、[-6, -5, -4, -5, -4, -3, -4, -3, -2]
B、[10, 20, 30, 72, 90, 108, 196, 224, 252]
C、z=[5,5,5,6, 6, 6,7,7,7]  
D、[8, 9, 10, 13, 14, 15, 18, 19, 20]

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