The most basic concept of attachment theory is that

A) love is composed of three elements or components, as in the points of a triangle.
B) it is the capacity to be resistant to others' giving that makes one lovable and human.
C) it is pathological to share honest emotions in a secure, intimate adult relationship.
D) to be a whole adult one needs to accept the fact that one is also a vulnerable child.

The most basic concept of attachment theory revolves around the idea that to become a whole adult, one must acknowledge and accept the fact that they were once a vulnerable child. This theory suggests that our early childhood experiences and the attachment styles we develop with our primary caregivers influence our emotional and interpersonal functioning in adulthood. Therefore, individuals who are able to recognize and address these early attachment experiences are better able to form secure and healthy adult relationships. Options A and B are incorrect, as they do not accurately reflect the central tenets of attachment theory. Option C is also incorrect, as research has shown that honest emotional sharing is a crucial component of secure adult attachments.