need help in this DS

I think B is ans here.

Let's attack stem 2 here:

We are given (x+y+z) is positive. since >0
From stem : x+y+1<0
so, x+y<1>0
so sufficient !

From 1 :z>x+y+1 => x+y+1<z> x+y-z <1> x+y+z <2z> 2z-1 > 0
=> z > 1/2 not sufficient

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