Which of the Following Is an Example of Field Research

Multiple Choice

Which of the following is an example of field research?

A) taking opinion polls of people in an amusement park about its hygiene and cleanliness
B) flashing different color lights on players on the pitch during a soccer game
C) testing the effects of chemicals on animals in an industrial lab
D) observing changes in the moods of people in a laboratory when they are exposed to violent movies