Then, in the second paragraph, King says...

"Perhaps a more tragic recognition of reality took place when it became clear to me that the war was doing far more than devastating the hopes of the poor at home. It was sending their sons and their brothers and their husbands to fight and to die in extraordinarily high proportions relative to the rest of the population. We were taking the black young men who had been crippled by our society and sending them eight thousand miles away to guarantee liberties in Southeast Asia which they had not found in southwest Georgia and East Harlem."

primarily to...

a
make a logical point
b
establish his credibility
c
appeal to the audience's emotions
d
inform his audience about the Vietnam War
Then, in the second paragraph, King says...

"Perhaps a more tragic recognition of reality took place when it became clear to me that the war was doing far more than devastating the hopes of the poor at home. It was sending their sons and their brothers and their husbands to fight and to die in extraordinarily high proportions relative to the rest of the population. We were taking the black young men who had been crippled by our society and sending them eight thousand miles away to guarantee liberties in Southeast Asia which they had not found in southwest Georgia and East Harlem."

primarily to...

a
make a logical point
b
establish his credibility
c
appeal to the audience's emotions
d
inform his audience about the Vietnam War