Which Is an Example of Niche Complementarity

Multiple Choice

Which is an example of niche complementarity?

A) Species of anemone fish associated with the same anemone tending to be found in different shore zones, while anemone fish living in the same zone tend to be associated with different anemone species.
B) Two species of phytoplankton that coexist when resources are balanced.
C) Three mongoose species that overlap and develop morphological variation in response to selection for smaller prey.
D) All of the above