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 2I. Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be 8I. The angle between polarizer A and C is:
a. 0∘
b. 30∘
c. 45∘
d. 60∘