the answer is C ; they change from happy to cynical.
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We are to explain what smart cities meant from the author's perspective (point of view)
The correct answer is option D
The statement which best summarizes the author's perspective on smart cities is "Smart cities are most successful when they are developed to benefit the population".
- Smart cities are best when it is developed for the benefit of it's citizens. The major aim of smart cities should be for the benefits of the citizens.
- Smart cities can be said to have been achieved when it is beneficial to people living in it.
- Smart cities should help improve the quality of life citizens.
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