Answer:
This illustrates the developmental principle that:
E. development is cumulative
Step-by-step explanation:
Even thought he monkeys were rehabilitated, their past experience and the feelings associated with it haven't ceased to exist. Development is nothing but an accumulation of events and their consequential influences over us. That means present moments build upon past moments. And, depending on what we are experiencing at the present, we may return to a past moment that is somehow being reminded to us. Our behaviors may become more childish or simply strange, because this current event has triggered the emotions of an earlier event. That is precisely what was observed in those monkeys. Though rehabilitated, they would return to their anxious behavior when caged for testing, since it reminded them of the childhood they were forced to spend deprived of love and care.