The stages of Piaget s Cognitive Developmental Theory

The stages of Piaget s Cognitive Developmental Theory are divided into sensorimotor, preoperational, concrete operational and formal operational.
Miko is a child who is able to understand the concepts of conservation, problem solving, and simple logic. Miko s younger sister, Midori, spends much of her time putting new objects in her mouth, and has recently begun saying a few words. What stages are Miko and Midori most likely in according to Piaget s theory?
Concrete operational and sensorimotor
Sensorimotor and formal operational
Concrete operational and formal operational
Preoperational and formal operational