The Grasses (Such as Barley,rice,sorghum,and Corn)vary Widely in the Size

Multiple Choice

The grasses (such as barley,rice,sorghum,and corn) vary widely in the size of their genomes,yet they are descended from a common ancestor.What accounts for the variation in DNA content (i.e.,the total amount of DNA) ?

A) large-scale duplication of genes
B) large-scale loss of genes
C) accumulation of LTR retrotransposons
D) loss of LTR retrotransposons
E) None of the answer options are correct.