Answer:
B. He spent many hours studying their lives and learning about them from friends and family.
Step-by-step explanation:
Chadwick Boseman played the roles of Jackie Robinson and Thurgood Marshall very well because he spent considerable time learning their mannerism and lifestyle by spending time with their friends and family.
Mr. Boseman spent seven months preparing for the role of Jackie Robinson and filming it and he had to learn baseball all over again. In that time period, he also talked to friends and family of the icons he was to portray, both Jackie Robinson and Thurgood Marshall.