The central idea of the article is developed by . Group of answer choices a. Exploring how the all-white jury arrived at its decision to acquit Roy Bryant and J. W. Milam in Emmett Till's death b. Questioning the reasons why the Justice Department has been unable to make progress in Emmett Till's case c. Providing background about the death of Emmett Till and the revelation that led to reopening the case d. Illustrating the role that Timothy B. Tyson's research materials have played in the FBI's solution to Emmett Till's death