The listener can best learn about the attitude of the speaker or the writer from the tone of the speech and the article. Thus, option A is the correct option.
A tone is an element that is used by the speaker to showcase the feelings and emotions of the speaker so that the clear attitude and the intention of the speaker are delivered.
The tone of the speech does not provide the evidence to support the claim, the place where the speaker gives the speech, nor does it provides the speech structure.
Therefore, option A. the attitude of the speaker is delivered by the tone.
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