What effect has urbanization had on air pollution in the United States and around the world? A. People driving fewer cars results in more air pollution.
B. Providing less mass transportation leads to less air pollution.
C. Increased combustion causing more air pollution.
D. People driving more cars leads to less air pollution.

C. Increased combustion causing more air pollution.

Explanation:

"Urbanization" refers to a situation wherein many people move to the city to live and leave the rural area behind. This means that the population of the city  increases. The more people living in the city, the more vehicles there are. Vehicles work through combustion, which produces pollutants into the air. So this means that the increasing number of vehicles results to an increasing amount of air pollution.

corrupt also means cruel

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.