Final answer:
Congruence is the correct term for the harmony between an individual's beliefs about themselves and their behavior. This concept is relevant in psychology and is critical for self-awareness and personal development.
Step-by-step explanation:
The response to the question lies in understanding what concept pertains to the alignment of individuals' self-concept with their actions. The correct answer from the options provided is d. congruence. Congruence means that there is harmony between what people believe about themselves and how they behave. It is the state of agreement or alignment between one's self-image and one's actions. This concept is important in the field of psychology, particularly in areas related to self-awareness and personal development.