The author develops the central idea by showing how a flying car would work and how it would benefit society.
We can arrive at this answer because:
The central idea of a text is the main subject to which the text refers.
In “The Dream of a Flying Car Getting Closer to Reality” we can see that the central idea is the possibility of there being flying cars.
To develop this central idea, the author shows how the flying car will work and how it will be good for people.
The author shows how a flying car would reduce traffic jams and how beneficial it would be if this were a hybrid car, allowing the driver to drive and fly.
