Which of the Following Is an Example of an Evolutionary

Which of the following is an example of an evolutionary adaptation that decreases herbivory?

A) Plants of the milkweed family produce a toxin that Monarch butterflies can store in their bodies.
B) Corn plants attacked by herbivores release an airborne chemical that turns on defensive genes in nearby corn plants.
C) Caterpillars that feed on plants tend to be green.
D) Damaged, partially eaten leaves can seal off the damaged area by hardening cell walls.