Which one of the following is NOT a reason why Cesar Chavez faced diff

Which one of the following is NOT a reason why Cesar Chavez faced difficulty organizing the farm workers’ union?

A) Most farm workers experienced high rates of unemployment.
B) Most farm workers were already protected by provisions of the National Labor Relations (Wagner) Act.
C) Most farm workers were divided into a variety of competing ethnic groups.
D) Most farm workers suffered from high rates of illiteracy and poverty.

ANSWER
B