What happened to Emmett Till's killers? They were executed.
They were acquitted.
They were sentenced to prison.
They fled to another state.

Explanation:

Emmett Louis Till (July 25, 1941 – August 28, 1955) was a 14-year-old African American who was lynched in Mississippi in 1955, after being accused of offending a white woman in her family's grocery store. The brutality of his murder and the fact that his killers were acquitted drew attention to the long history of violent persecution of African Americans in the United States. Till posthumously became an icon of the civil rights movement.[1]

Till was born and raised in Chicago, Illinois. During summer vacation in August 1955, he was visiting relatives near Money, in the Mississippi Delta region. He spoke to 21-year-old Carolyn Bryant, the white married proprietor of a small grocery store there. Although what happened at the store is a matter of dispute, Till was accused of flirting with or whistling at Bryant. Till's interaction with Bryant, perhaps unwittingly if at all, violated the strictures of conduct for an African-American male interacting with a white woman in the Jim Crow-era South.[2] Several nights after the incident in the store, Bryant's husband Roy and his half-brother J.W. Milam were armed when they went to Till's great-uncle's house and abducted the boy. They took him away and beat and mutilated him before shooting him in the head and sinking his body in the Tallahatchie River. Three days later, Till's body was discovered and retrieved from the river.

Till's body was returned to Chicago where his mother insisted on a public funeral service with an open casket which was held at Roberts Temple Church of God in Christ.[3] "The open-coffin funeral held by Mamie Till Bradley exposed the world to more than her son Emmett Till's bloated, mutilated body. Her decision focused attention not only on U.S. racism and the barbarism of lynching but also on the limitations and vulnerabilities of American democracy".[4] Tens of thousands attended his funeral or viewed his open casket, and images of his mutilated body were published in black-oriented magazines and newspapers, rallying popular black support and white sympathy across the U.S. Intense scrutiny was brought to bear on the lack of black civil rights in Mississippi, with newspapers around the U.S. critical of the state. Although local newspapers and law enforcement officials initially decried the violence against Till and called for justice, they responded to national criticism by defending Mississippians, temporarily giving support to the killers.

c) legal battles last five weeks after the election due to the narrow victory in several states.