Question

which city was called \window on the west\? london paris st. petersburg rome

Explanation:

St. Petersburg (formerly Leningrad, Petrograd) in Russia is historically known as the "Window on the West" because it was built by Peter the Great to connect Russia with Western Europe, adopting Western architectural, cultural, and administrative influences. London, Paris, and Rome do not have this specific moniker related to being a window to the West for their respective regions in the same context.

Answer:

C. St. Petersburg