What is the central idea of this excerpt from the goatherd and the wild goats

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Reread paragraph 4 what direct impact did the efforts of individuals like ava deer have

Which of the following factors most consistently contributes to the speaker’s believability? a the age and experience of the speaker b the physical environment in which the speech is delivered c the sincerity, knowledge, and trustworthiness of the speaker d the position of the thesis statement in the speech