Formal language is also called "proper language" because it is the type of language you would use when first meeting someone or giving a speech at a high class place so the correct answer is:
<span>B) Have I convinced you that the study of grammar is important and well worth your effort? </span>
I would say “Mocking” due to the use of rhetorical questions and almost sarcastic remarks
The correct answer is B. Ethos. Ethos is one of the three famous rhetorical appeals by Cicero, and it is the appeal to the credibility of the speaker.
