According to mary ainsworth's experiment, a child who plays independently, ignoring his mother, whether she remains in the room or leaves him with a stranger, is demonstrating attachment.
a. resistant
b. ambivalent
c. secure
d. avoidance

According to Mary Ainsworth's experiment, a child who plays independently, ignoring his mother, whether she remains in the room or leaves him with a stranger, is demonstrating avoidance attachment. Also, both the mother and the stranger can equally comfort the child. The answer would be letter D.