Four different phylogenetic trees of a group of salamanders have been proposed. Trees A and B each require 12 homoplasies, but Tree A requires 14 synapomorphies and Tree B requires 13 synapomorphies. Tree C requires 15 homoplasies and 13 synapomorphies. Finally, Tree D requires 10 homoplasies and 15 synamorphies. According to the principle of parsimony, which tree or trees is the best?