Acentral idea of nadine gordimer's "once upon a time" is that physical safety motivates the actions of the main characters. which of the following statements indicates a consequence of that motivation? growing isolation in the suburbs diminishing trust within the family mounting overnight tensions in the city increasing agitation among their neighbors

I think the answer is: growing isolation in the suburbs

Physical safety would mean that you are putting yourself out of harm's way. Hence, this can be linked to isolation in the suburbs. A lot of harm can be present in suburb communities especially at night. This may be the motivation why the characters have to distance themselves from harm in the suburbs.

i believe that is the truth if thats what you where asking for