The Presence of Altruistic Behaviour Is Most Likely Due to Kin

The presence of altruistic behaviour is most likely due to kin selection, a theory maintaining that

A) aggression between sexes promotes the survival of the fittest individuals.
B) genes enhance survival of copies of themselves by directing organisms to assist others who share those genes.
C) companionship is advantageous to animals because in the future they can help each other.
D) critical thinking abilities are normal traits for animals and they have arisen, like other traits, through natural selection.
E) natural selection has generally favoured the evolution of exaggerated aggressive and submissive behaviours to resolve conflict without grave harm to participants.