The answer is C.) because of the present participle "has". If the present participle "has" wasn't in the sentence, then the answer would be B.). Anyway, the answer is C.) because of "has". (has spoken). I hope that helps :)
Answer: Maintain a loud, forceful tone throughout the speech to maintain audience interest.
Explanation:
http://www.essaytyper.com/ go to this page and put in expository writing, then click random keys.
Explanation:
Hope this helps :), it works ive used it many times