Why Is It Important to Preserve the Genetic Diversity of the Wild

Why is it important to preserve the genetic diversity of the wild relatives of crop plants?

A) The wild relatives may someday have to replace the crop plants because they are generally more disease-resistant.
B) The wild relatives are food sources for many domestic animal species.
C) The wild relatives may someday have to replace the crop plants because they are generally more resistant to insect pests.
D) The wild relatives are food sources for a large percentage of the human population.
E) Beneficial genes from the wild relatives may be transferred into crop plants.