Travis and jennifer are growing apart. they only discussâ "safe" topics such as the weather. which ofâ knapp's stages of romantic relational development are theyâ experiencing

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.

answer; the correct answer is (composition);