Anation has a high human development index and a high gross domestic product. which of the following factors might result in classification of the nation as developing rather than developed?
a. a high per capita income
b. a command economy
c. mechanization of farms
d. a full market economy

answer; /// i believe that the correct answer is(

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.