Answer
B.
Work Step by Step
A parsimonious answer is the simplest one, in this case resorting to common ancestor (B.). A. is wrong since it is the opposite of simple/parsimonious, and C. is incorrect because, if this were a case of homoplasy, C. would be essentially the same as A., which is wrong. D. is wrong since homology is usually parsimonious, contrary to what D. says.