If \( z_{1}, z_{2}, \ldots, z_{100} \) are root of equation \( 1+z+z^{2}+\ldots+z^{100}= \) then...

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If \( z_{1}, z_{2}, \ldots, z_{100} \) are root of equation \( 1+z+z^{2}+\ldots+z^{100}= \) then the value of \( \sum_{r=1}^{100} \frac{1}{z_{r}-1} \) is equal to
(a) 100
(b) -50
(c) -25
(d) 150
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