In a Series of Laboratory Experiments,psychologists Harry and Margaret Harlow

In a series of laboratory experiments,psychologists Harry and Margaret Harlow attempted to:

A) demonstrate the effects of social isolation on nonhuman primates raised without contact with others of their own species
B) demonstrate that human development occurs in three states that reflect different levels of the personality
C) demonstrate how conflicts that coincide with major changes in a person's social environment can be resolved in a positive manner
D) demonstrate that cognitive development occurs in stages and children's activities are governed by their perception of the world around them