Which of the following causes of alcoholism are not discussed in the passage

A．Difficulty in adjusting to changes leads to alcoholism.
B．Nutritional deficiency is a major cause of alcoholism.
C．The rate of alcoholism is low in a group where customs toward drinking are fixed.
D．Man cannot be exempt from physical and social stresses.

A．They can not tolerate great pain under every situation.
B．They have a stronger will power than those who do not believe in a religion.
C．Prayers and meditation increase their pain threshold.
D．They need higher doses of pain to lose consciousness.