Professor sanford explains that the need for physical safety must be met before city dwellers will be motivated to form close friendships with neighbors. professor sanford is providing an example of

It seems like Professor Sanford is drawing from Maslow's Hierarchy of Needs. This theory states that individuals start at the bottom of the pyramid and work their way up. Therefore, the basic need of safety must be met before one can move to the next block, where one meets their needs for belongingness and love. Hope that helps!