Which of the Following Statements Concerning Attachment Is True

Which of the following statements concerning attachment is true?

A) Stranger anxiety and separation anxiety occur at approximately the same time, when the child is about 6 or 7 months old.
B) Stranger anxiety and separation anxiety occur at approximately the same time, when the child is between 12 and 16 months old.
C) Stranger anxiety begins just after the age of 6 or 7 months, while separation anxiety peaks somewhere between the ages of 12 and 16 months.
D) Separation anxiety develops around the age of 6 or 7 months, while stranger anxiety develops somewhere between the ages of 12 and 16 months.