Which of the Following Is NOT True About Context and Rhetorical

Which of the following is NOT true about context and rhetorical situation?

A) The medium through which a speech is delivered is an important part of a speech's context.
B) Rhetoricians should take into account the argumentational history of the ideas they discuss.
C) Speakers should not be distracted by contextual factors; they should do their best to ignore factors like physical setting and occasion.
D) None of the above