The correct answer is B. One person can make a huge difference in the lives of others
Step-by-step explanation:
In texts, the theme refers to the belief about life or some aspect of it such as love, death, education, war, etc. the author of a text aims at communicating to the reader and that becomes an underlying idea of a text. This underlying idea or theme can be stated explicitly but the writer, but in most cases is developed through the actions, beliefs, and behaviors of the characters. This is the case of the theme of the text presented in the question, considering the author does not state the theme directly, but suggest that the main character Luma has helped the kids and their families is positive or desirable and had a positive impact on everyone's life even on the teachers, which meant the belief or theme the author wants to convey is that even small actions have a positive impact on others or that "one person can make a huge difference in the lives of others".