One Researcher Defines Aggressive Behaviour in Kids as Instances of Punching

One researcher defines aggressive behaviour in kids as instances of punching and kicking.Another researcher defines aggressive behaviour in kids as any instance of hitting,kicking,biting,pushing,yelling,screaming,name-calling,scratching,etc.Both researchers conduct observational studies of kids on the playground at recess.These two researchers may find different results in their studies mainly due to

A) different experimental conditions.
B) use of different samples of participants.
C) differences in their operational definitions of aggression.
D) the experimenter expectancy bias.

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