Which of the following best describes something that is generally accepted and has superior power?

The term that describes something generally accepted and having superior power is "prevailing." In this context, "prevailing" refers to ideas, beliefs, or conditions that are dominant or widespread at a particular time; they are widely recognized and often hold authority over opposing views or alternatives. This term underscores the idea of consensus or acceptance across a broad spectrum of society, indicating that the concept in question is not only acknowledged but also influential in shaping perceptions or actions.

In contrast, other choices such as "controversial" refers to topics that evoke disagreement or differing opinions, making them less likely to be seen as accepted or powerful in a general sense. "Fringe" denotes ideas or practices that are outside the mainstream, and thus lack acceptance and power. Lastly, "unconventional" indicates something that deviates from the norm, which implies it does not have that widespread acceptance and power associated with prevailing concepts. Therefore, "prevailing" is the answer that encapsulates the idea of broad acceptance and authority.