The correct answer is The letter defends the strategy of non-violent resistance to racism.
The American Martin Luther King Jr. was one of the great icons of the 20th century. His great popularity was due to the leadership he exercised in the fight for civil rights of blacks in the United States of America, in the 1950s and 1960s. King had a great capacity to speak in public and to gather a large number of people in demonstrations. against the racial segregation laws of the southern states of the USA. For this characteristic, he was awarded the Nobel Peace Prize in 1964. Four years later, his life was interrupted by the hands of James Earl Ray.