Final answer:
The underlined sentences in the paragraph serve to summarize the reasons and evidence, reinforcing the benefits of owning an electric car in the conclusion.
Step-by-step explanation:
The underlined sentences in the paragraph illustrate the goal of summarizing the reasons and evidence in a concluding paragraph. They bring together the benefits of owning an electric car by highlighting that it is a more cost-effective, safer, and environmentally friendly choice. The writer aims to reiterate these points to reinforce the original claim made earlier in the text, but they don't simply restate the claim; instead, they provide a concise summary of the key points.