Why is providing evidence to support your position an important part of building an argument? . a.. the speaker should provide evidence only when asked by the audience.. b.. the speaker does not have to provide any evidence to support his or her position.. c.. the speaker provides evidence only when discussing the opposition's side, during the rebuttal stage of a formal debate.. d.. providing evidence indicates that the person understands the issue, carefully thought about his or her position, and then found supporting research to defend that position in an effort to convince the audience..