The states and the congress. If a constitutional amendment is going to be ratified, first it has to get votes of support from 2/3 of both the house of representatives and the senate, after which it goes on voting in individual states, and if 3/4 of states ratify it then it becomes an official amendment of the constitution.
The correct answer for this question is this one: "B) widespread use of public transportation." Prior to WWII, people living in cities in the United States enjoyed widespread use of public transportation.
Here are the following choices:A) a housing boom.
B) widespread use of public transportation.
C) increasing quality of public housing.
D) improving air quality.