Why Did Congress Pass the Voting Rights Act of 1965

Why did Congress pass the Voting Rights Act of 1965?

A) to facilitate the prosecution of those who had restricted the voting rights of African Americans
B) because it was clear that some states had no intention of living up to the spirit of the Fifteenth Amendment
C) because Congress was afraid Martin Luther King Jr. would lead a boycott of White businesses if the legislation was not passed
D) to prevent the race riots from spreading from African American neighborhoods into traditionally White neighborhoods