Which of the Following Best Describes "Game Theory" as It

Which of the following best describes "game theory" as it applies to animal behaviour?

A) The fitness of a particular behaviour is influenced by other behavioural phenotypes in a population.
B) The total of all of the behavioural displays, both male and female, is related to courtship.
C) An individual in a population changes a behavioural phenotype to gain a competitive advantage.
D) The play behaviour performed by juveniles allows them to perfect adult behaviours that are needed for survival, such as hunting, courtship, and so on.
E) The evolutionary "game" is played between predator and prey, wherein the prey develops a behaviour through natural selection that enables it to be less vulnerable to predation, and the predator counters with a new reciprocal predatory behaviour.