According to Piaget's theory of cognitive development, what is the age range…

Piaget's theory of cognitive development divides childhood mental growth into four sequential stages, each marked by a characteristic age range and mode of thinking: the sensorimotor stage, the preoperational stage, the concrete operational stage, and the formal operational stage. The preoperational stage is the period in which a child begins using symbols and language but has not yet developed logical, reversible reasoning about concrete objects.

Piaget placed the preoperational stage right after the sensorimotor stage (which runs from birth until the child begins using symbols) and right before the concrete operational stage (in which logical reasoning about concrete objects emerges). This places the preoperational stage between two and seven years of age — matching the option 'Two to seven years,' the verified answer.

Checking the other age ranges against Piaget's own stage sequence:

• 'Birth to two years' describes the sensorimotor stage — the period of sensory and motor exploration before symbolic thought begins — not the stage in question.

• 'Four to eight years' and 'Five to eight years' both shift the boundaries later, into the age band where children start reasoning logically about concrete objects (the concrete operational stage) — a capability the preoperational child has not yet developed.