The animal psychologists Robert Yerkes struggled with the problem of consciousness and came up with three grades or levels that correspond to behavior. Form lowest to highest these levels were:

Question

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Yerkes' three grades or levels are based on behavior and are arranged in order of increasing complexity. The first level is discriminative behavior, which includes reflexes and simple learned behaviors. The second level is intelligent behavior, which involves problem-solving and more complex learning. The third level is rational behavior, which involves the ability to reason and think abstractly. Therefore, the correct order of levels is discriminitive - intelligent - rational, as shown in option B.

The Animal Psychologists Robert Yerkes Struggled with the Problem of Consciousness