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Explanation:

Rhetoric can arouse feelings in an electorate, so says the author. Hence, option (a) can be ruled out.
An advertisement jingle or the dialogues or a play are prepared to attract the audience and keep the audience attentive. Therefore, both 2 and 3 can be ruled out.
An army officer’s command to his subordinate will have to be obeyed whether the command was used wit rhetoric or not. Hence, it will have the least element of rhetoric.
Hence, the correct answer is option 4.