Which of the following is an example of a newborn reflex?

Choice A rationale Crying is an expressive behavior and communication method for the newborn, signaling needs like hunger or discomfort, but it is not classified as a primitive or protective reflex. Primitive reflexes are involuntary, automatic motor responses integrated by the central nervous system that typically disappear as the cerebral cortex matures. Choice B rationale Grasping, specifically the palmar grasp reflex, is an involuntary, primitive newborn reflex where stroking the palm causes the infant to close the fingers in a tight grip. This is an example of an automatic, protective motor response mediated by the central nervous system that is present at birth and typically fades around three to six months of age. Choice C rationale Talking is a complex, acquired developmental milestone involving sophisticated cognitive, motor, and linguistic skills. It requires extensive learning and maturation of the cerebral cortex, distinguishing it as a learned behavior, not an innate, involuntary, and transient newborn reflex present from birth. Choice D rationale Walking, or ambulation, is a major gross motor developmental milestone achieved typically between 9 and 18 months of age, requiring significant muscle strength, coordination, and cerebral maturation. While the stepping (or walking) reflex is present at birth, voluntary walking is a learned skill, not a transient newborn reflex.