When scientists discuss the point in the evolutionary process at which a sense of fairness arose in human beings, one of two theories generally prevails. The first theory holds that a sense of fairness – or, more generally, morality – is a late and mostly intellectual addition to the evolutionary process. In this view morality is defined as a set of rules agreed upon by a society, permitting human beings to “rise above” the raw violence and competition found in “nature.” In certain circles this idea is known as “veneer theory,” because it posits human morality as a thin crust on a violently churning interior.
The second theory, by contrast, does not set nature and morality in direct opposition, but rather holds a sense of fairness to be as much a part of human “nature” as violence and competition. Advocates of this theory most often appeal to the behavior of other primates to argue that humans possess an innate sense of fairness common to other species of a shared evolutionary past. Orangutans, for example, have been observed to throw temper tantrums when teased by being shown an apple they are not allowed to have. Experiments with monkeys offering them two kinds of rewards for performing simple tasks have shown that they will refuse the less-preferred reward if they see their companions receiving the preferred reward for performing the same task.
According to the passage, which of the following is evidence that the development of a sense of fairness occurred early in the evolution of human beings?
A. History shows that violence and competition have not been a significant part of human behavior.
B. Societies establish laws designed to enforce agreed-upon ideals of fairness, and to protect members from violence.
C. Observation demonstrates that this sense is shared by other primates such as orangutans and monkeys.
D. Orangutans became visibly upset when they were unfairly denied something they wanted.
E. Experiments involving monkeys prove that primates feel entitled to rewards when they have successfully completed simple tasks.