Answer: A) oppression and segregation imposed upon African Americans.
Jackie Robinson was the first African American to play in Major League Baseball (MLB) in the US. He was also involved in the Civil Rights Movement and was an advocate for integration.
In this letter, Robinson addresses the "treatment" he and others have experienced. Although he does not explain what the treatment is in this section, it is reasonable to assume that he is referring to the discrimination and oppression imposed upon African Americans. The other options are events that are too specific or recent, while Jackie states that the treatment has been going on for years.
