Why Does the Law Distinguish Psychiatric Injury from Physical Injury

Why does the law distinguish psychiatric injury from physical injury?
Please select all that apply.

A) Difficulties in distinguishing between mere grief and psychiatric illnesses
B) 'Floodgate' concerns about a significant increase in the number of potential claims if recovery for psychiatric injury was not limited
C) To avoid potential unfairness to the defendant of imposing damages out of all proportion to the negligent conduct
D) Because physically injuring someone is worse than causing them psychiatric harm
E) To avoid the possible disincentive effect of potential compensation awards on potential claimants