How do paragraphs 7-8 contribute to the development of ideas in the article? a. they explicate the causes of inefficiency and lack of safety in the former transit system. b. they provide an example of a city that could benefit from transitioning into a smart city. c. they reiterate that the technology integrated in cities tends to benefit local government more than citizens. d. they provide an example of how technology has been integrated in a city to improve the transit system and the lives of citizens.