To determine the tone of a paragraph, you need to consider the overall feeling or attitude that the author is conveying through their words. In this case, the paragraph discusses the work of the Peace Corps and how it helps people in different countries. The sentences convey a positive and optimistic attitude towards the ability of Americans to make a difference in the world.
The author mentions the idea that Americans have a vast ability to help others in peaceful ways and describes the specific examples of providing healthy and safe food in Paraguay and support for education in Liberia. The use of words like "helping," "support," and "build bridges toward a better world" indicates a positive and hopeful view.
Based on this analysis, the tone of the paragraph is most likely C - Hopeful.