What Is Considered the Hallmark of Children Who Are Securely

What is considered the hallmark of children who are securely attached to their mothers?

A) The child never cries and is secure enough to not demand face-to-face interactions with the mother.
B) The mother responds to the child constantly to the point of being overly responsive.
C) The mother is sensitive to the child's needs, is aware of the child's moods, can discriminate the infant's signals, and is responsive, warm, and affectionate.
D) The child has no fear of strangers and demonstrates that he/she is equally comfortable with unfamiliar adults and the mother.