“When thinking” is the right answer (the definition of retrospect is “a survey or review of a past course of events or period of time”. So “when thinking “ is most likely the right answer.
The best answer is D because it has incorrect grammar, and uses slang/jargon and a dialect known as ebonics that was typically present in black communities during this time.
Answers are as follow:
Part A
What argument does Kennedy make in his “Ich bin ein Berliner” speech?
ANS: Democracy is morally superior to communism.
Part B
Which answer choice presents the most logical reasoning in support of the argument identified in Part A?
ANS: "... we have never had to put a wall up to keep our people in."