Final answer:
The completed sentence is an example of a concluding paragraph in a personal essay.
Step-by-step explanation:
(a) I finally realized I can complain about the big things I can't solve, or I can contribute to a solution by taking small steps in my own life.
(b) It's a concluding paragraph.
The completed sentence is an example of a concluding paragraph. In this paragraph, the writer reflects on the impact they can make by taking small steps in their own life, such as walking instead of driving and turning off lights at home. This paragraph brings the personal essay to a close and concludes the main idea of the essay, which is the importance of individual actions in making a difference.
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