I would say the tone of this sentence is formal.
Answer:
it is A
Explanation:
because it's the one that makes more sense
Well you have to show sentence nine
Explanation:
Exigence an event or circumstance that engenders rhetoric; the requirement is the one that starts the "loop" of the debate on rhetoric about a specific subject. Purpose: the desired results of (implicitly or explicitly) rhetorical speech defined by the rhetoric.