When an Ant Finds a Source of Food,such as an Open

When an ant finds a source of food,such as an open sugar bin in a kitchen,it returns to the nest,leaving a trail that other ants can follow to the sugar.This is a case of

A) innate knowledge of where food is located.
B) a learned response that is an advantage of social insects.
C) a pheromone pathway,a type of chemical communication.
D) marking territory.
E) higher reasoning,just as a hiker leaving signs along a trail.