The items in the list that are effects of physical features on Russian culture would be:
2. coat-check rooms in restaurants, hotels, and museums - This is influenced by the climate, as people often need to check in heavy winter clothing when indoors.
4. Black Sea vacation houses - The physical feature of the Black Sea influences the location of vacation homes, as it offers a coastal resort area.
5. the distinctive architecture of St. Petersburg - The climate and geography of the region influenced architectural styles and urban planning.
Thus, the correct option is:
C. 2, 3, and 4