According to Patricia and Paul Brantingham, What Problem Do Neighbourhood

According to Patricia and Paul Brantingham, what problem do neighbourhood watch programs have?

A) They rely on neighbours who might mistake innocent people (like service personnel) for burglars.
B) Neighbourhood watch works only in neighbourhoods where the houses are situated in very close proximity to one another.
C) The programs probably have only the main effect of improving people's attitudes about their neighbourhoods.
D) The programs are instituted only in low-crime areas, so it is hard to prove they work.