【单选题】

at the outset, instead of shifting thing about may be pheromones released when they reach committee size.

A、The stimuli set them off ... build collectively
B、The stimuli that set them off ... building collectively
C、The stimuli setting them off ... they build collectively
D、Being set off by stimuli ... their building collectively

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根据网考网移动考试中心的统计，该试题：

27%的考友选择了A选项

69%的考友选择了B选项

1%的考友选择了C选项

3%的考友选择了D选项

______ at the outset, ______ instead of shifting thing about may be pheromones released when they reach committee size.

at the outset, instead of shifting thing about may be pheromones released when they reach committee size.