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Math·Geometry and Trigonometry·Lines, angles, and triangles

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In the figure shown, line $k$ intersects lines $r$ and $s$. If $w=160$, which additional piece of information is sufficient to prove that lines $r$ and $s$ are parallel?

A

$x=20$

B

$y=160$

C

$w+y=180$

D

$y+z=180$