Leaves of a Plant May Be Damaged Accidentally-For Example,when an Animal

Leaves of a plant may be damaged accidentally-for example,when an animal steps on them.In this situation,the plant does not mobilize its immune defenses;it only does so in case of herbivory.How does the plant tell the difference?

A) Herbivory lasts longer than accidental injury.
B) Herbivory is more damaging than accidental injury.
C) Herbivores release chemicals that mimic plant reactions.
D) Herbivores cause mechanical damage;accidental injury does not.
E) Herbivores release elicitors in their saliva,triggering plant reactions.