The game of 'peek-a-boo' relies on the concept of object permanence, a milestone in Piaget's sensorimotor stage. Object permanence is the understanding that objects and people continue to exist even when they are no longer visible. When an infant realizes that the person hiding behind their hands has not ceased to exist, they demonstrate the cognitive ability to maintain a mental representation of that person.

The grasping reflex, also known as the palmar grasp, occurs when an object is placed in an infant's palm, causing the fingers to close tightly around it. This reflex is considered an evolutionary remnant that may have helped infants cling to their caregivers for safety and stability. It is a strong, involuntary response that typically fades as the infant develops more voluntary motor control.

The rooting reflex is an automatic response in newborns where they turn their head toward the side of the cheek that is stroked or touched. This reflex is essential for survival, as it helps the infant locate a nipple or bottle for feeding. It typically disappears as the infant matures and gains more voluntary control over their movements.

The rooting reflex causes an infant to turn their head toward a touch on the cheek to find the nipple, while the sucking reflex allows the infant to draw milk once the nipple is in their mouth. Both are essential survival mechanisms for neonatal feeding, making both A and C correct.

The rooting reflex is an essential survival mechanism present in newborns. When the corner of an infant's mouth or cheek is stroked, the infant automatically turns their head toward the stimulus and opens their mouth. This reflex facilitates breastfeeding by helping the infant locate the nipple or bottle, ensuring they can receive necessary nutrition shortly after birth.

The rooting reflex is a survival mechanism in newborns that helps them locate a source of food. When the cheek or corner of the mouth is stroked, the infant automatically turns their head toward the stimulus and begins sucking motions. This reflex is essential for successful breastfeeding or bottle-feeding during the first few months of life.

The palmar grasp reflex is a primitive reflex found in newborns. When an object or finger is placed in the infant's palm, the baby will automatically curl their fingers around it, creating a firm grip. This reflex is an evolutionary remnant that typically disappears within the first few months of life as the infant's nervous system matures and voluntary motor control begins to develop.

Newborns are born with a variety of automatic, involuntary responses known as primitive reflexes. The rooting reflex assists in feeding, the blink reflex protects the eyes, and the withdrawal reflex helps the infant avoid painful stimuli, all of which are essential for early survival.

At birth, human infants are biologically dependent on caregivers for survival, meaning they cannot fulfill their own basic needs such as feeding or thermoregulation. While they are capable of responding to stimuli and are influenced by their environment, the inability to self-regulate or provide for their own needs is a defining characteristic of the neonatal period.

These behaviors are categorized as inborn reflexes because they are involuntary, automatic motor responses triggered by specific sensory stimuli. Present from birth, these reflexes are essential for an infant's survival, facilitating feeding and physical interaction with the environment. Unlike complex learned behaviors, these responses are hardwired into the nervous system, ensuring the infant can perform vital functions immediately upon entering the world.