Before the religious council, the apostles stressed the:
a. humanity of jesus
b. love of jesus
c. ministry of jesus while he was on earth
d. death, resurrection, and exaltation of jesus

Th answer you are looking for is: 
D.) Death, resurrection, and exaltation of Jesus 
Hope that helps!! 
Have a wonderful day!! 
If you ever need anything pleas feel free to ask me!!

This letter was a open letter, and it was to persuade people who were criticizing MLK. he addresses people who think that the blacks should have just stayed home and not created a 'scene.'  It was directed at white people, although not specifically to anyone