If \( \mathrm{z} \) is a complex number satisfying the equation \[ ...

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If \( \mathrm{z} \) is a complex number satisfying the equation
\[
Z^{6}+Z^{3}+1=0 \text {. }
\]
\( \mathrm{P} \)
If this equation has a root \( \mathrm{re}^{\mathrm{i} \theta} \) with \( 90^{\circ}\theta180^{\circ} \) then the value of \( { }^{\prime} \theta^{\prime} \) is
W
(A) \( 100^{\circ} \)
(B) \( 110^{\circ} \)
(C) \( 160^{\circ} \)
(D) \( 170^{\circ} \)
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