Which practice contributes the most to land pollution?

answer; /// i do believe that the correct answer is (d) cooperative play; /// good luck

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.

this is called police cynicism. i hope this .

answer; the above statement is ( false );