During Which Substage of Piaget's Sensorimotor Stage Does the Child

Multiple Choice

During which substage of Piaget's sensorimotor stage does the child "begin to act upon the outside world," a process by which infants seek to repeat enjoyable events in their environments if they happen to produce them through chance activities?

A) Substage 2: First habits and primary circular reactions
B) Substage 1: Simple reflexes
C) Substage 3: Secondary circular reactions
D) Substage 4: Coordination of secondary circular reactions