Which of the Following Statements Describes a Purpose for Which

Which of the following statements describes a purpose for which biologists use phylogenetic trees?

A) For human diseases once found only in other animals, phylogenetic trees are helpful in determining when and where the infectious organisms first entered human populations.
B) Phylogenetic trees are useful for determining how many times a particular trait may have evolved independently within a lineage.
C) Phylogenetic trees can be used to reconstruct ancestral traits.
D) Phylogenetic trees can be used in conjunction with molecular clocks to estimate the timing of evolutionary events.
E) All of the above