Which of these is not a common programming language?

• A. Fortran
• B. Java
• C. Clingonian
• D. Perl

Answer: (C)

Recognizing real programming languages versus fictional-sounding names is what this question is about. Fortran is one of the oldest programming languages, historically used in scientific and numerical computing. Java is a widely adopted, platform-independent language used across many kinds of applications and environments. Perl is a well-known scripting language, especially popular for text processing and quick automation tasks. Clingonian, on the other hand, isn’t a known language in the programming world—it isn’t documented or supported, and you wouldn’t find standard tooling for it. That contrast is why it’s the one that isn’t a common programming language. The other options are real languages you’d encounter in courses, industry, and documentation.