Answer:
D. Lower life expectancies
Explanation:
I hope it helps
I believe the answer is: <span>discovery of the influence of the unconscious mind.
Prior to this discovery, many experts in psychology were stuck in finding some explanations of some abnormal behaviors (such as split personality).
The discovery of unconscious mind would provide a theory on such occurrences and provide a lead that can be used by them to cure it</span>
Because each child is unique so they each act differently and do stuff/complete stuff in different ways
Sorry if wrong hope this helps
because they want you to spend money on something pointless