Among these choices, Prolog is the best known language for AI.
Explanation About the other options
FORTRAN. Now, though this one was long used to have an active role in scientific computations and was never well known so much more about AI designs.
PROLOG is Specifically designed with an application to AI and which is utilized abundantly in symbolic reasoning as well as logical programming, for the development of an expert system, as in applying a natural language process, since the pattern-matching capabilities are bettered along with better of logical inference.
C. Although C is a general power language, which may well be used in AI, especially for performance-critical applications, this language is even less specialized for AI-specific tasks than Prolog.
COBOL This one is used primarily in business applications and isn't usually related to the domain of AI development.
Prolog can be indeed relevant to the domain of AI.
In summary, among all the options provided, Prolog is the most relevant programming language in artificial intelligence.