Needs and emotions. Hitler rose to power because the Germans were very poor and in need of a saviour. Hitler managed to come in right place right time and promise jobs to the jobless, money to the struggling and prosperity for Germany as a whole. He captivated people with his incredible tactics of delivering speeches and won them over by appealing to their emotions.
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The correct answer for the given question above would be the last option: plain folks. Plain folks is the propaganda technique used in the sentence. Plain folks is a type of propaganda technique which shows the person as an average or just an ordinary person making him or her trustworthy.