The dsm-iv-tr does not:

a) include a classification of personality disorders.
b) explain the causes of the various psychological disorders.
c) include a very broad range of psychological disorders.
d) provide reliable guidelines for diagnosing psychological disorders.
e) list symptoms within descriptions of each disorder.

The DSM-IV-TR does not : B. Explain the causes of the various psychological disorders
Even to this day, Psychologists couldn't exactly point out the exact causes of various psychological disorders because there are too much factors are involved

hope this helps

Hamlet's fourth soliloquy is probably his most famous one - "to be or not to be."it is rather different from his previous soliloquies because now he is contemplating something that didn't come up before - suicide. he is thinking whether it is worth it to fight to find his father's murderer when in the end all of them are going to die, so why not die sooner than later. he is contemplating if he should go on fighting or just kill himself and end it all, which is why this soliloquy in particular is rather depressing, hesitant, and gives a deeper insight into hamlet's madness.