If a line makes an angle alpha,beta,gamm...

If a line makes an angle `alpha,beta,gamma` with positive axes, then the range of `sinalphasinbeta+sinbetasingamma+singammasinalpha` is (A) `(-1/2,1)` (B) `(1/2,2)` (C) `(-1,2)` (D) `(-1,2]`

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