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Unpolarized light of intensity I passes ...

Unpolarized light of intensity I passes through an ideal polarizer A . Another identical polarizer `B` is placed behind `A` .The intensity of light beyond `B` is found to be `I/2` . Now another identical polarizer `C` is placed between `A` and `B` .The intensity of light beyond `B` is now `I/8`. The angle between polarizer `A` and `C` is
1) `0^(@)`
2) `30^(@)`
3) `45^(@)`
4) `60^(@)`

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