Answer: The statement that best explains how Kennedy uses a rhetorical technique to support his message is *He uses repetition to emphasize change on the horizon for people who are struggling.*
Step-by-step explanation:
Kennedy makes use of the phrase "to those" at the beginning of every paragraph in order to make an emphasis on the coming change for the kind of audience he wants to convey his message to. He is also making use of repetition to achieve a successful attachment with the receiver of the message.