Two polaroids are placed in the path of unpolarized beam of intensity `I_(0)` such that no light is emitted from the second polarid. If a third polaroid whose polarization axis makes an angle `theta` with the polarization axis of first polaroid, is placed between these two polariods then the intensity of light emerging from the last polaroid will be

A. `(I_(0)/8) sin^(2) 2theta`

B. `(I_(0)/4) sin^(2) 2theta`

C. `(I_(0)/2) cos^(4) theta`

D. `I_(0) cos^(4) theta`