Which of the following could be the considered the main idea for Dr. King's speech?

A)King knows that equality is not something he will see during his lifetime, but is confident that his children will eventually live in a world of equality.
B)King does not believe that America is ready to grant African Americans their freedom, but is hopeful for a future in which this is possible.
C)King’s dream is for African Americans to be free, and makes it clear he will do anything to achieve this, no matter the consequences.
D)King believes that African Americans should not be denied their civil rights, and encourages others to be relentless in their non-violent fight for freedom.