15. In game theory, does the population average fitness always increase as evolution proceeds?
(a) Yes, because natural selection means "survival of the fittest," the population average fitness must increase over time.
(b) Yes, because in game theory, animals must act rationally, and rational behaviors lead to higher fitness.
(c) No, because evolution is short-sighted, and a strategy that can increase one animal's fitness may decrease the population's fitness overall.
(d) No, because game theory and evolution are not related to each other.