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Because a+b+c=0, x= 1 and y=0, exclude d.

Because the opening is downward.

The remaining a and c are 50% ...

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Left and right are different. If it is a, the symbols of a.b are different, and c is greater than zero. One of A or B will be less than zero, which does not conform to a>b>c.

So, choose C.

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