The Genome of the Rice Plant Was Completely Sequenced in 2002

The genome of the rice plant was completely sequenced in 2002. What features of the rice genome make it useful for sequencing efforts in other grass species, such as wheat and corn?

A) These other grass species have genomes that are considerably larger than that of rice.
B) The grasses have a common evolutionary ancestor.
C) A smaller, more easily sequenced genome can serve as a model for the mapping and isolation of genes in the larger genomes.
D) Many genes are present in the same order in related grass species' genomes (the genomes are collinear) .
E) All of the answers are correct.