单项选择题
According to the passage, behavioral psychologists studying the extinction process have discerned which of the following（）
A．The exact length of time required for a fear response to become extinct in a human subject
B．The effect of tone conditioning in comparison with other forms of stimuli
C．The possible effects of surgical operations on the infralimbic cortice
D．The potential of tone conditioning in treating undesirable fear responses
E．The limits of Pavlov's contribution to modern behavioral psychology
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