How Has Organized Labor Changed Its Position on Illegal Immigration

How has organized labor changed its position on illegal immigration?

A) In the past, labor unions felt that illegal immigrants took jobs away from US workers; but now that immigrants are performing jobs that many US-born workers do not want, unions see them as allies in the efforts to further worker benefits.
B) Organized labor used to avoid immigrant workers, but now that US workers demand so many benefits and higher wages, unions are pressured to hire immigrants and hope the companies will not get caught.
C) Organized labor does not support immigrant workers and strives to protect American workers only.
D) In the past, labor unions supported immigrant rights, but now that they have put so many US workers out of jobs, there is little support.