Final answer:
The primary developmental task of an infant according to Erikson's stages is b) Trust vs. Mistrust, where responsive caregiving leads to a sense of trust, and unresponsive care can cause mistrust.
Step-by-step explanation:
According to Erikson's stages of psychosocial development, the primary development task of an infant is b) Trust vs. Mistrust. Infants, ranging from birth to 12 months, are heavily reliant on their caregivers. The way in which caregivers respond to their infant's needs plays a crucial role in the child's psychosocial development.
Sensitive and responsive caregiving helps the infant develop a sense of trust, leading them to perceive the world as a safe and predictable environment. Conversely, unresponsive caregivers can lead to feelings of anxiety, fear, and mistrust in the infant, causing them to see the world as unpredictable and inconsistent.