Polarised Light Is to Have Its Polarisation Plane Rotated by 90

Multiple Choice

Polarised light is to have its polarisation plane rotated by 90 $\degree$ .In which of the following cases does the final beam have the greatest intensity?

A) 3 polarising filters, each rotate beam by 30 $\degree$ .
B) 2 polarising filters, both rotate beam by 45 $\degree$ .
C) 1 polarising filter, rotating beam by 90 $\degree$ .
D) None of the above, polarised light can't be rotated.