Rice and Its Grain Relatives, Maize, Barley, and Wheat, Diverged

Rice and its grain relatives, maize, barley, and wheat, diverged from a common ancestor about 50 million years ago. What main advantage does this afford research in crop genomics?

A) It identifies linkage disequilibrium between multiple crop types.
B) Single nucleotide polymorphisms are clearly defined in many plants used as crops.
C) STS can be isolated in more than one plant leading to better crop production.
D) It allows for useful genes in crops to be identified in multiple species of plants.