The Competitive Exclusion Principle Does Not Usually Apply in the Real

The competitive exclusion principle does not usually apply in the real world because

A) its conception was based on a complex experimental environment and the real world is much more simple.
B) it is only applicable to grain beetles.
C) in the real world predation is much more important.
D) in the real world competitive interactions are modified by a range of other interactions.
E) equilibrium is reached in ecosystems before the extreme conditions are reached.