Some anthropologists study modern-day societies of foragers in an effort to learn about our ancient ancestors who were also foragers. A flaw in this strategy is that forager societies are extremely varied. Indeed, any forager society with which anthropologists are familiar has had considerable contact with modern, non-forager societies. Which of the following, if true, would most weaken the criticism made above of the anthropologists' strategy? ['All anthropologists study one kind or another of modern-day society.', 'Most ancient forager societies either dissolved or made a transition to another way of life.', 'Even those modern-day forager societies that have not had significant contact with modern societies are importantly different from ancient forager societies.', 'All forager societies throughout history have had a number of important features in common that are absent from other types of societies.']