So I know the equation:
Itrans = I0 Cos2θ
Since this light starts out as polarized, there is no need to cut it in half like you do for unpolarized light. So I did the equation through the first polzarizer, using 30 degree as my angle, and came out with I=0.75
Now I used that 0.75 as my new I0 as the light went through the 2nd polarizer, this time I used 60 degrees as my θ and I got 0.1875, which would be B.
However, I saw the same problem elsewhere where the guy got D) as the answer because he used 30 for θ instead of 60.