Blast from the past question. Over the last 100 years, the United States has experienced significant improvements in transportation ad technology. As a result, urban centers of today differ from those of the 1800s in the modern cities.
A)can be located farther from supplies of food and fresh water
B)are more attractive to newly arrived immigrants
C)are less likely to suffer from environmental pollution
D)can be reliant on one primary product or service for income