Y will always be positive so can safely be ignored for now. All we need to do is prove that x and z are opposite signs.

1) (x^2)y < 0

X will always be positive this inequality => y < 0 but that doesn’t help.

Insufficient.

2) yz < 0

Both are opposite signs. Nothing about x. Insufficient.

1+2)

We know y < 0 and z >0 but nothing about x. Insufficient.

E.

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