After common ragweed etched Japan a century ago and escaped their leaf beetle predators, populations of the plants evolved reduced investment in defense and greater investment in growth. During the past 30 years ragweed leaf beetles have appeared in some parts of mainland Japan. Which of the following scenarios is most likely now happening as a result?

A. Japanese ragweed is evolving greater investment in defense and greater investment in growth bc both defense and growth are beneficial

B. Japanese ragweed is evolving back toward greater investments in defense and reduced investment in growth as a result of selection by herbivore from beetles

C. Japanese ragweed is not evolving a new investment strategy bc it takes more than a couple of decades for a popular to evolve

D. Japanese ragweed is not evolving a new investment strategy bc the beetles no longer eat the plants