Which statement best describes the role of muckrakers? a) they encouraged the growth of railroads. b) they reported favorably about the lives of the rich. c) they increased the power of trusts. d)they exposed corrupt business and political practices.

The answer is D, they worked to expose the corrupt businesses like Boss Tweed.

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.

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