A campaign speech is usually offered to an audience with the intent of convincing them about the suitability of a candidate. It is common in politics. Given this premise, the author's purpose when delivering a campaign speech is usually to;
During a campaign speech, the author reels out reasons to indicate that a given candidate is qualified for a certain position.
The audience might be uncertain about the qualifications and suitability of the candidate for the position.
The author has the responsibility of convincing and persuading the audience of the suitability of a candidate.
Therefore, option A which is, persuasion, is the purpose of a campaign speech.
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