In a series of laboratory experiments, psychologists Harry and Margaret Harlow attempted to demonstrate __________.
A) the effects of social isolation on nonhuman primates raised without contact with others of their own species
B) that human development occurs in three stages that reflect different levels of the personality
C) how conflicts that coincide with major changes in a person's social environment can be resolved in a positive manner
D) that cognitive development occurs in stages that are significantly different for human and nonhuman primates

Question

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The Harlows conducted a series of experiments to demonstrate the effects of social isolation on nonhuman primates, specifically on their social and cognitive development. They raised infant monkeys in isolation, with no contact with others of their own species, and observed the negative impacts on their behavior, emotional well-being, and ability to form social relationships later in life.

In a Series of Laboratory Experiments, Psychologists Harry and Margaret