Integrate over x:the conditional denominator is 1+3y+z. The conditional first-moment numerator is 2/3+(3y+z)/2. At y=z=1/3,this ratio is (2/3+2/3)/(1+4/3)=4/7. For all finite y,z in the cube,the ratio exceeds 1/2,excluding C,D,and B’s value is too large. **A**.
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