Which statement best describes how the background on Emmett Till's life help us understand the impact of his murder?

D. Because of his upbringing, he did not act how white southerners expected blacks to act, so his murderers singled him out as a sign of unwanted racial progress.

Explanation:

Emmett Till, a 14 years old boy was killed in the summer of 1955 Mississippi , in when he went to visit his uncle Mose Wright. His growth in Chicago, in a predominantly black neighborhood made him unaware of how deep racial prejudice was.

He had confidence that he was as good as the whites and that made Bob Bryant and his friends more furious at him. They were not happy that he could confidently challenge them and this resulted in his brutal murder.

MLA.

Explanation:

In-text citations and works cited pages are a necessary part of any academic or research paper writing. They present the crucial part of what a paper is and also helped readers know and understand the sources of how the paper is written from.

Though there are several styles or formats of writing such papers, the most used is the MLA format. Modern Language Association "MLA" format is used to write humanities and literature papers.

Thus, the correct answer is MLA.