Your teacher has very <em><u>(B) convincing</u></em> arguments.
The word 'convincing' suits the sentence better, although <u><em>D) loud</em></u> does sounds right in the sentence, I believe it should be <em><u>B) convincing</u></em>. Because of it's accuracy in the sentence.
Hopefully this helps :3 sorry if wrong :( plz mark brainiest if correct :D Your bootiful/handsome! Have a great day luv <3