Question 7 of 10 The centers of most cities became business areas after the invention of what? A. The bicycle B. The airplane c. The steamship D. The streetcar

To determine which invention led to the centers of most cities becoming business areas, we can analyze the impact of each option: A. **The bicycle** - While the bicycle allowed for easier transportation, it did not significantly change the structure of cities or their business areas. B. **The airplane** - The airplane revolutionized long-distance travel but did not have a direct impact on the urban centers of cities. C. **The steamship** - The steamship improved maritime trade and transportation but primarily affected coastal cities and trade routes rather than the urban centers. D. **The streetcar** - The streetcar allowed for the expansion of cities and made it easier for people to commute from residential areas to business districts. This led to the development of urban centers as business areas. Based on this analysis, the correct answer is: **D. The streetcar**