C

Piaget’s pre-operational stage begins after the sensorimotor period and lasts until the onset of concrete operations, covering roughly the early preschool years; most texts place it from about 2 to 7 years of age, i.e., approximately 2-6 years in rounded terms [Asokan, 2014, PMID 25231036; Houdé, 2020, PMID 32958170].