What is the most important reason to sequence an entire genome of a model organism,such as that of C.elegans,a nematode?

A)it allows researchers to use the sequence to build a "better" nematode, which is 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.