Piaget believed that some adults never reach which stage of development?

Choice A reason: The sensorimotor stage occurs from birth to approximately 2 years of age and involves learning through sensory experiences and motor actions. All adults have passed this stage. Choice B reason: The preoperational stage spans ages 2 to 7 and is characterized by symbolic thinking and egocentrism. Adults universally progress beyond this stage. Choice C reason: The concrete operational stage (ages 7–11) involves logical thinking about concrete events. Most adults reach and surpass this stage. Choice D reason: The formal operational stage begins around age 11 and involves abstract reasoning, hypothetical thinking, and deductive logic. Piaget acknowledged that not all adults develop this level of cognitive functioning, especially if their environment does not demand it.