A Caterpillar Eats a Leaf of a Plant

A caterpillar eats a leaf of a plant.The next day it crawls to a nearby leaf to eat.But after eating the second leaf,the caterpillar gets very sick and falls off the plant.Which of the following molecules were involved in the plant's ability to defend itself against the second attack?

A)proteinase inhibitors
B)systemin
C)jasmonic acid
D)proteinase inhibitors,systemin,and jasmonic acid
E)proteinase inhibitors and jasmonic acid

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