Among Trinidadian guppies, males with large spots are more attractive to females than are males with small spots, who consequently are presented with less frequent mating opportunities. Yet guppies with small spots are more likely to avoid detection by predators, so in waters where predators are abundant only guppies with small spots live to maturity. The situation described above most closely conforms to which one of the following generalizations? ['Those organisms that survive the longest have the greatest number of offspring.', 'A trait that is helpful to procreation can also hinder it in certain environments.', 'A trait that helps attract mates is sometimes more dangerous to one sex than to another.', 'Whether a trait is harmful to the organisms of a species can depend on which sex possesses it.']