单选题

It can be inferred from the passage that in speciesin which vigilant behavior is directed at predators, the tendency of the animals to be more vigilant in smaller groupsthan in larger ones would most likely be minimized if which of the following were true?

A、 The vigilance of animals on the periphery of a group always exceeded that of animalslocated in its interior, even when predators were not in the area.
B、 The risk of capture for individuals in a group was the same, whether they were located in the interior of the group or on its periphery.
C、 Animals on the periphery of a group tended to be less capable of defending themselves from attack by predators than animals located in the interior of the group.
D、 Animals on the periphery of a group tended to bear marks that were more distinctive to predators than animals located in the interior of the group.
E、 Animals on the periphery of a group tended to have shorter life spans than animal slocated in the interior of the group.

【正确答案】 B

【答案解析】