An Unpolarized Beam of Light Has Intensity I₀ $\theta$ Find $\theta$

Multiple Choice

An unpolarized beam of light has intensity I₀. It is incident on two ideal polarizing sheets. The angle between the axes of polarization of these sheets is $\theta$ . Find $\theta$ if the emerging light has intensity I₀/4:

A) sin^-1(1/2)
B)
C) cos^-1(1/2)
D)
E) tan^-1(1/4)