The Following Phylogeny Shows Six Living Species (A-F) and Five

The following phylogeny shows six living species (a-f) and five ancestral (now extinct) species (1-5) . If the phylogeny had been developed on the basis of similarities in bone structure, which of the following predictions would you make in terms of the structure of a particular enzyme?

A) The enzymes of species b and f are very similar.
B) The enzymes of species b and c are more similar to ancestor 4 than to ancestor 2
C) The enzymes of species a and b are the same as that of ancestor 2.
D) The enzyme of species c is very similar to that of species d.