Answer: B) repetition of key words.
Explanation: When writing, an author can use several rhetorical devices in order to persuade, inform or impact the audience in the desired way. In the given sentences from a speech the author uses repetition of key wors as a rhetorical strategy (to create an impact on the audience), specifically, the repetition of the phrase "don't listen" at the end of the first sentence and at the beginning of the second one.