i got C.
Answer is C. Well done man, this is a tough one.
Care to explain why? I know that "they" references "Muslims" but why is it better than A for instance?
first of all ,D changes the meaning.
there is a lot of difference between " if " and "when".
A is wrong....because the initial part of the sentence should be followed immediately by the " thing" that is modified..
C corrects the mistake