According to Mahler's theory, the period of childhood is divided into:: (A) Normal autistic phase, (B) Normal symbiotic phase, (C) Separation industrialisation phase, (D) All of the above
Answer is D. According to Mahler's theory, the period of childhood is divided into three stages.

Normal autistic phase (0 - 1 year)
Normal symbiotic phase (4 wks to 4 yrs)
Separation individualization phase (5 to 36 months)