Professional Ski Instructors Of America (PSIA) Level 3 Practice Exam

The main idea being tested is Piaget’s sensorimotor stage, where infants learn about the world through action and sensation. In this stage, from birth to about age two, thinking is grounded in concrete interactions with the environment rather than in symbols or abstract ideas. Infants start with reflexes and gradually organize them into purposeful actions, coordinating what they see, hear, and do to explore and learn. A hallmark development here is object permanence—the understanding that objects exist even when not visible—emerging as they interact with their surroundings. By the end of this stage, they begin to form simple mental representations, but their thinking remains closely tied to immediate sensory and motor experiences rather than abstract reasoning. So the statement that best captures this is the description of a 0 to about age two period in which the child explores the world through sensory stimulation and motor activity. The other descriptions align with later Piagetian stages, which involve more abstract thought, symbolic understanding, and manipulation of objects in the mind rather than through direct interaction.