Julie Is a Developmental Psychologist Who Is Interested in Studying

Julie is a developmental psychologist who is interested in studying young children's helping behavior in a playroom setting. Her lab is set up to resemble a playroom containing toys and child-sized furniture. Adjacent to the "playroom" is a room for Julie and her research assistants to observe the behavior of children who participate in their study. There is a one-way mirror installed on the wall that separates the playroom from the observation room, as a strategy dealing with:

A) habituation.
B) reactivity.
C) ethical concerns.
D) construct validity.