What is typically built outside residences for spiritual protection in Thailand?

The correct choice is spirit houses, which are small structures built outside homes in Thailand to honor and provide a dwelling for spirits or deities. The belief is that these spirits act as guardians of the home, ensuring protection and prosperity for the residents. Spirit houses often come adorned with offerings like food, flowers, and incense, indicating respect and reverence for the spiritual beings they house.

The other options, while relevant in various cultural contexts, do not serve the same specific purpose. Statues of Buddha may hold religious significance and can be found in many places in Thailand, but they are not primarily intended for spiritual protection of residences. Monumental sculptures may be important in traditional Thai artistry and cultural expression but lack the personal connection to spiritual guardianship associated with spirit houses. Prayer flags, commonly used in Tibetan Buddhism, symbolize good luck and the invocation of blessings but are not a feature specific to typical Thai residential architecture for spiritual protection.