Final answer:
a. Symbolic convergence is the concept that best fits with fantasy themes voiced across many groups.
Step-by-step explanation:
The correct option is a) Symbolic convergence. Symbolic convergence is a concept in communication theory that refers to the shared meaning and understanding that is created when groups of individuals come together and share similar fantasies, stories, and symbols.
It is the process through which group members develop a sense of identity and community by sharing and converging on common symbols and meanings.