The question is incomplete and the full version can be found online.
Answer: a development in technology
Explanation:
The question refers to an excerpt from Chapter 5 of Wheels of Change: How Women Rode the Bicycle to Freedom (With a Few Flat Tires Along the Way), by Sue Macy. The excerpt narrates the development of the automobile, which is a development in technology. Is not a world event, because the automobile developed at different times in each country. And it´s not a change in national politics, society, or its values.
The first one is the correct way to use it, since it separates the parts of the sentence into fragments that can still be understood without changing the meaning of the entire sentence.
