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 synapomorphies. according to the principle of parsimony, which tree(s) is/are the most accurate? a) tree a only b) tree b only c) tree c only d) tree d only e) both tree a and tree b