When the researcher's sex affect the behaviour of a participant in a study, it refers to

Correct option is C

The term "biosocial effect" refers to the influence that social and biological factors have on individuals. In the context of research, if the researcher's sex affects the behavior of a participant, it is considered a biosocial effect because it combines biological aspects (sex of the researcher) with social interactions (the participant's reaction to the researcher's sex). This can be an important consideration in the design and interpretation of studies, particularly those involving personal or sensitive topics where the sex of the researcher might influence the responses or behaviors of participants.
 
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·         Psychosocial Effect: This effect involves an interplay between psychological factors and social relationships, impacting behavior, such as stress levels influenced by social dynamics.
·         Psychological Effect: Refers to the impact on an individual's mental state and behavior due to psychological processes and reactions
·         Environmental Effect: Involves changes in behavior or responses that are prompted by physical or social surroundings