Biogeography is the study of the distribution of species in different regions through the history of life on earth. the map below shows the approximate arrangement of five continents in earth's past. the distributions of several ancient species, based on fossil evidence, are also shown.

on which modern-day continents would you be most likely to find organisms that share cynognathus as a common ancestor?

a
africa and south america only

b
africa, antarctica, and south america only

c
africa, antarctica, india, and south america only

d
africa, antarctica, australia, india, and south america