There are statement 1, 2, 4, 6, 7 are specific reasons that speaker uses rhetorical devices.
What is rhetorical devices?
A rhetorical device is a linguistic tool that employs a particular type of sentence structure, sound, or pattern of meaning in order to evoke a particular reaction from an audience.
(1) - To help them influence their audience
(2) - To emphasize important points
(4) - To help the audience remember statistics or evidence related to the message
(6) - To clarify information or important points
(7) - To present information creatively and keep the audience interested.
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