The rhetorical technique most used in this excerpt is a rhetorical shift. thus option D is correct.
This passage uses a rhetorical shift as its chosen rhetorical device. When a speaker or writer modifies the tone or style of a speech or written piece, it is known as a rhetorical shift.
The image missing in query is given below:
We can observe that there was a shift in the speech that was presented. The first thing the speaker mentioned was what the Allies went through in the first four years of the war. Then, as he was ready to change direction, he added the word "And yet" to indicate that, at the conclusion of the first four years, Allied morale was still higher than German morale.
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