Among Which of the Following Groups of Organisms Is Cooperation

Among which of the following groups of organisms is cooperation via reciprocal altruism most likely to evolve (assuming all else is equal) ?

A) birds from across a species' range that congregate for a short time at a resting spot during migration
B) short-lived, immobile tidal organisms that are in constant contact with one another and have a high mortality via predation
C) female tigers that each inhabit their own large home range
D) primates in a social group that frequently interact with the same individuals