As the King intend to stop the desegregation of lunch counters by a non-violent protest in Birmingham, the city invited Luther King to give a speech.
In 1960s, Martin Luther King announced that he would lead a demonstration in Birmingham because the city was one of the most segregated cities in the USA.
Because the King intended to force the desegregation of lunch counters in downtown shops by a non-violent protest, the city invited him to give a speech.
Therefore, the Option B is correct.
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