According to Mahler's theory, period of normal symbiotic phase is:: (A) 0 - 1 year, (B) 4 weeks to 4 years, (C) 8 weeks to 8 years, (D) 5 to 36 months
Answer is B. According to Mahler's theory:

The normal autistic phase is 0-1 year.
Normal symbiotic phase is 4 weeks to 4 years.
Separation individualization phase is 5 to 36 months.