The conclusion drawn in the passage above depends on which of the following assumptions? A. The insects that successfully detoxify milkweed are not able to undergo the evolutionary changes necessary to allow them to detoxify other plants. B. Unlike milkweed, other kinds of toxic plants would be able to overcome their vulnerabilities to predators through evolutionary changes. C. The toxin-carrying veins of the milkweed plant can never evolve in such a way that insects cannot cut through. D. The method of detoxification used by insect predators of milkweed would not successfully detoxify other kinds of toxic plants. E. There are insects that use means other than draining the toxin in order to feed on toxic plants.