Task: Question Answering
Input (English): Background Paragraph: Another possible benefit of aggregation is to protect against predation by group anti-predator behavior. Many species exhibit higher rates of predator vigilance behavior per individual at lower density. This increased vigilance might result in less time and energy spent on foraging, thus reducing the fitness of an individual living in smaller groups. One striking example of such shared vigilance is exhibited by meerkats. Meanwhile, other species move in synchrony to confuse and avoid predators such as schools of sardines and flocks of starlings. The confusion effect that this herding behavior would have on predators will be more effective when more individuals are present.Cooperative feeding. 
Story: Two different types of animals live in the same habitat but have vastly different behaviors. Animals A and B are both the same size which is relatively small. Animal A lives in small groups of 4 or 5. Animal B however lives in very large groups and when they move around they all move at the same time. Both groups are also hunted by the same predator. 
Question: Which group likely relies on confusing potential predators, group A or B?
Output (English): B.