According to Claude Fischer,how Do Cities Create Opportunities for Close,rewarding

According to Claude Fischer,how do cities create opportunities for close,rewarding friendships and social ties?

A) The repeated interactions between those living on the same street eventually lead to friendships.
B) The anonymity required for most everyday interactions enhances relationships formed in other ways.
C) Work and school life are more intimate than in other places.
D) The large number and diversity of urban dwellers allows subcultures to flourish.