I think the answer would be B: H<span>is belief that americans must respond to these acts. Good luck.</span>
The tone which is not effective for convincing people that they should subscribe to your perspective is definitely C) sarcastic. Nobody is going to listen to you if you offend or mock them.
The best thesis statement would be:
A. Schools should encourage volunteering because it reduces stress, promotes personal growth, and has a positive effect on society.
This is the best because it provides the topic "Schools should encourage volunteering" and then it goes on to provide reasons for this that will most likely be described in the rest of the paper.
Hope this helps!
Because it's features are water maybe if sorry