hard · SAT Reading & Writing
In a study of primate behavior, researchers observed that in groups of capuchin monkeys, individuals would often refuse a piece of cucumber—a perfectly acceptable food—if they saw a neighbor receiving a grape, which they prefer. This 'inequity aversion' was thought to show a primitive sense of fairness. However, later experiments showed that the monkeys also refused the cucumber if the grape was simply placed in an empty cage nearby, even when no other monkey was present to receive it.
Which choice most logically completes the text?
- Grapes contain a higher sugar content and caloric density than cucumbers.
- The monkeys' behavior may reflect frustration at missing the reward rather than a concern for fairness.
- All primates possess a highly developed moral compass that governs their interactions with one another.
- Capuchin monkeys are incapable of distinguishing between different types of food based on quality.
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