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If `a^(r) = (cos 2 r pi + I sin 2 r pi )^(1//9)` , then the value of `|{:(a_(1), a_(2), a_(3)),(a_(4), a_(5), a^(6)),(a_(7) , a_(8), a_(9)):}|` is

A

`a_(1)a_(9)-a_(3)a_(7)`

B

`a_(2)a_(6)-a_(4)a_(8)`

C

`a_(9)`

D

`a_(5)`

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