Final answer:
The concept where we make our fears of unworthiness in relationships come true by acting accordingly is called a self-fulfilling prophecy, which is option A.
Step-by-step explanation:
If we enter relationships unsure of our lovability, we may act in ways that unintentionally manifest our fears into reality. This phenomenon is known as a self-fulfilling prophecy. It essentially means that our belief about a certain outcome can come to pass as a result of our behavior influenced by that belief.
In the context of relationships, a self-fulfilling prophecy might lead someone to act withdrawn or behave in an unloving way because they fear rejection. This behavior might then lead to the feared outcome of actual rejection. In contrast, having positive beliefs about our relationships can lead to more open and mutually rewarding interactions, demonstrating the power of expectations in our social dynamics.