Infants Often Show Distress at Being Separated from Their Primary

Infants often show distress at being separated from their primary caregiver:

A) around 7-8 months because by then they have a strong attachment to their primary caregiver
B) around 4-6 months of age when they develop a sense of self-awareness
C) immediately after birth as they have become attached in utero to their mother
D) around 2-3 months of age before they have developed adequate schemas for strangers and nonstrangers