问题详情

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out
A．how little pheromone is needed to mark a trail
B．the different types of pheromones ants can produce
C．a type of ant that is common in many parts of the world
D．that certain ants can produce up to one milligram of pheromone请帮忙给出正确答案和分析，谢谢！