Why is repetition a useful rhetorical device for a political speech?

A. Repetition is not useful because it slows a speech down.
B. Repeated words or thoughts create a rhythm in a speech and reinforce the message.
C. Repetition is a good way to present logical arguments in an unbiased way.
D. Repetition is a good way to lengthen a speech that has few ideas.

the correct answer in B.