Below is a phylogeny depicting the relationships of nine species of extant beetles, labeled 1-9. A 'P' above their number indicates that the species is poisonous, and an 'NP' indicates that the species is non-poisonous. Some of the ancestor species are also labeled, A-D. Which of the following statements is most likely accurate regarding this group of species?
a. Ancestor A was the first beetle to possess the poison trait.
b. That both species 8 and species 4 possess the poison trait is an example of convergent evolution.
c. The poison trait evolved independently four different times.
d. Ancestor D likely possessed the poison trait.