According to fredrickson, people’s reactions to positive emotions tend to be cognitive. reactions to negative emotions tend to be physical fearful

physical

Explanation:

Barbara Lee Fredrickson is an American professor born June 15, 1964 who specializes in the area Psychology. According to my research on studies conducted by Fredrickson, I can say that based on the information provided within the question reactions to negative emotions tend to be physical. For example fear makes people tense up and makes our bodies react by jumping, Heartbreak or Loss makes us cry, have chest pains, and feel tired.

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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.

c: in the east might be the correct answer