In which of the domains would it be easiest to determine the phylogenetic relationships among organisms?

A) The Bacteria are easiest because they have the smallest amounts of DNA which can be sequenced quickly.
B) The Eukaryotes are easiest because they tend not to share genetic material with each other except when they are reproducing sexually.
C) The Archaea are easiest because they are the most ancient and have the greatest amount of genetic variation among them.
D) The Animalia are easiest because they are large enough that their morphological characteristics are clearly visible.