Answer:
B. He spent many hours studying their lives and learning about them from friends and family.
Step-by-step explanation:
Chadwick Boseman was so skilled at playing the roles of pioneers such as Jackie Robinson and Thurgood Marshall because he immersed himself in the role and learned many things about their lives from friends and family.
For the role of Jackie Robinson, Mr. Chadwick spent months learning how to play baseball and he also spent time learning about Mr. Thurgood, Boseman spent time in Baltimore, Thurgood's hometown to learn more about the civil rights activist to interpret the role perfectly.