According to piagets, the period of pre operational stage is:
(A) Birth to 18 months (B) 12 years onwards. (C) 2-6 years. (D) 7-12 years.
(C) According to Piaget Cognitive theory, the sequence of development has been categorized into 4 major stages:

Sensorimotor stage (0 to 2 yrs)
Pre-operational stage (2 to 6 yrs)
Concrete operation stage (7 to 12 yrs)
Formal operation stage (11 to 15 yrs)