One of the Biggest Differences Between Unions of the 1950s

One of the biggest differences between unions of the 1950s and unions of today is

A) the us-versus-them mentality of unions of the 1950s does not stand out today.
B) the mentality of unions that they can work as partners with employers to achieve the best results because all that was prominent in the 1950s does not exist today.
C) unions of the 1950s mainly represented workers with respect to wages and working conditions, which is not the case today.
D) whereas unions mainly looked out for their own interests in the 1950s, they look out for the interests of their members more so today.
E) whereas unions mainly looked out for the interests of their members in the 1950s, they look out for their own interests more so today.