Sequencing an Entire Genome, Such as That of C

Sequencing an entire genome, such as that of C. elegans, a nematode, is most important because

A) it allows researchers to use the sequence to build a "better" nematode, resistant to disease.
B) it allows research on a group of organisms we do not usually care much about.
C) the nematode is a good animal model for trying out cures for viral illness.
D) a sequence that is found to have a particular function in the nematode is likely to have a closely related function in vertebrates.
E) a sequence that is found to have no introns in the nematode genome is likely to have acquired the introns from higher organisms.