What best describes the theme conveyed by the white family’s heavily fortified home in nadine gordimer’s “once upon a time”?

the monotony of modern life
the arrogance of the upper classes
the segregation in south african society
the south african struggle for freedom

The answer would be the segregation in South African society. The story is about a white family living in South Africa. Although the time and place are unspecified, upon close observation (black housekeepers, riots, etc.,), we can determine that the setting is during South Africa's civil unrest. The term 'people of color' suggests they isolate themselves from people outside their society. They become fearful and made every security measure to protect their home. However, due to their own shrewdness, their son is cut into pieces atop the razor-wire fortifications.