Erik Erikson's theory of psychosocial development posits that the first stage, trust versus mistrust, is resolved when infants receive consistent, reliable care. This results in 'basic trust,' a sense that the world is a safe and predictable place, which serves as the foundation for all future social and emotional development.

Hazan and Shaver (1987) proposed that adult romantic relationships are essentially an extension of infant attachment styles. However, the provided answer key claims that adult relationships do not follow these forms, which contradicts the core findings of their seminal research. The study actually suggests that secure, anxious, and avoidant attachment styles in infancy directly influence how adults perceive and behave within their romantic partnerships.

Konrad Lorenz, an ethologist, is famous for his study of imprinting in birds, particularly greylag geese. He demonstrated that young birds form a rapid, innate attachment to the first moving object they encounter during a critical period shortly after hatching. This research provided significant insights into the biological basis of attachment and early learning behaviors in animals.

Option C is incorrect because attachment is a biological and psychological mechanism designed to increase an infant's survival by ensuring proximity to a caregiver. Attachments facilitate, rather than reduce, the receipt of nurturing, protection, and emotional security, which are essential for healthy social and emotional development throughout the lifespan.

Harry Harlow's classic research on rhesus monkeys demonstrated that infant monkeys preferred a soft, cloth-covered surrogate mother over a wire surrogate that provided food. This finding indicates that contact comfort, or physical touch, is a fundamental requirement for the formation of emotional attachment, far outweighing the importance of nourishment alone in the early stages of development.

Harry Harlow conducted influential experiments with rhesus monkeys, demonstrating that infant monkeys preferred a soft, cloth-covered surrogate mother over a wire mother that provided food. This research highlighted the critical importance of contact comfort in the development of attachment.

Harlow's research demonstrated that infant monkeys preferred a soft, cloth-covered surrogate mother over a wire mother that provided food. The cloth mother served as a 'secure base,' providing comfort and emotional security, which allowed the infants to explore their environment. This study was foundational in understanding the importance of attachment and contact comfort in development.

Learning theories, particularly behaviorism, propose that attachment is a learned behavior. Infants associate caregivers with the reduction of primary drives like hunger and discomfort through classical and operant conditioning, reinforcing the bond between the infant and the caregiver.

The 'Strange Situation' is a standardized observational procedure designed by Mary Ainsworth to evaluate the quality of attachment between an infant and their primary caregiver. By observing the child's reaction to separation and reunion with the caregiver in an unfamiliar environment, researchers can classify attachment as secure, insecure-avoidant, or insecure-ambivalent.

The 'strange situation' is a standardized laboratory procedure developed by Mary Ainsworth to observe the attachment relationship between a caregiver and a child. It involves a series of separations and reunions to determine the quality of the child's attachment style, such as secure, avoidant, or anxious-ambivalent.