Many Plants Produce Volatile (Airborne) Compounds When Attacked by Herbivores

Many plants produce volatile (airborne) compounds when attacked by herbivores. In what ways do these compounds aid the plant in protecting itself?

A) They increase the production of defensive compounds in neighboring plants, thereby reducing the population density of herbivores.
B) They induce the production of defensive compounds in distant parts of the plant.
C) They inhibit the metabolism and growth of herbivores by interfering with their respiratory pathways.
D) They attract animals that can prey upon or parasitize the herbivores.
E) They provide no protection and are simply the result of chewing damage.