Which of the following is an INCORRECT statement regarding a community in the natural world?

A) A community is an association of populations of different species.
B) The species in a community live and interact, directly and indirectly with each other, in the same place at the same time.
C) The definition for community is deliberately broad.
D) Communities refer to ecological categories that vary greatly in size and have precise boundaries.
E) Communities are rarely completely isolated.