Although Lophotrochozoan Species with Spiral Cleavage Were Once Grouped Together

Although lophotrochozoan species with spiral cleavage were once grouped together taxonomically as spiralians, gene sequence analysis does not support the spiralian taxon as monophyletic.What conclusion follows from this evidence?

A) Spiral cleavage is a trait that is not determined by genes.
B) Species within the lophotrochozoans that do not have spiral cleavage are only distantly related to those that do have spiral cleavage.
C) Genetic sequence data are not useful in determining taxonomic relationships of these organisms.
D) Spiral cleavage may have been present in the lophotrochozoan ancestor, with several subsequent losses of this cleavage pattern.
E) Spiral cleavage is an evolutionary adaptation found within closely related organisms.