Answer:
B.
Back in 1974, Kissinger spoke of the "thin edge between hope and hunger." A generation on, it is time to take it seriously.
Explanation:
Rephrase the thesis in a new way
The caged bird singswith a joyous songof the captive life that kept it safe all along.This answer exemplifies the two birds: free and caged. Free in such a way that it is able to sing a song of its choice, and caged, because even if it is in captive it has something to be thankful for, its safety.
Answer:
B.-
Hopefully this is right BC the way you put the sentence confused me...