In the figure above, the shrublike or treelike species are circled in black. Looking at the figure ...

In the figure above, the shrublike or treelike species are circled in black. Looking at the figure above, which is the correct conclusion?
 
  a. For the herbaceous species, the branch lengths tend to be shorter and the rates of sequence change more slowly.
  b. For the herbaceous species, the branch lengths tend to be longer and the rates of sequence change more slowly.
  c. For the herbaceous species, the branch lengths tend to be longer and the rates of sequence change faster.
  d. For the herbaceous species, the branch lengths tend to be shorter and the rates of sequence change faster.