The Fact That the DNA Sequences of Most Homeotic Genes

The fact that the DNA sequences of most homeotic genes are very similar in a wide variety of animals suggests that

A) homeotic genes are in a location of the genome that rarely undergoes mutation.
B) homeotic genes probably evolved millions of years ago in the first animals.
C) mutations in homeotic genes have little impact on an organism.
D) homeotic genes play a minor role in the process of development.