Arch of Janus is present in:

A. Greece
B. Vatican City
C. Rome, Italy 
D. None of these

🧠 Explanation:

The Arch of Janus, located in Rome, Italy, is an ancient Roman monument. This structure is a key topic in history and architecture, engaging students and tourists. Understanding its significance clarifies Roman engineering, relevant for studying classical architecture. Its unique design attracts those exploring historical landmarks, highlighting its role in preserving Roman heritage, emphasizing its importance in understanding ancient urban planning and cultural history.