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Let alpha, beta denote the cube roots of...

Let `alpha, beta` denote the cube roots of unity other than 1 and `alpha ne beta`. Let
`s = sum_(n=0)^(302) (-1)^(n) ((alpha)/(beta))^(n)`.
Then the value of s is

A

either `-2omega or -2omega^(2)`

B

either `-2omega or 2omega^(2)`

C

either `2omega or -2omega^(2)`

D

either `2omega or 2omega^(2)`

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