There Are Both Early African and Early Asian Candidates Representing

There are both early African and early Asian candidates representing the origin of Anthropoids.Why haven't anthropologists conclusively determined which of these continents is where anthropoids originated?

A) Although the African fossil primate Biretia is older than the Asian fossil primate Eosimas,Biretia's features are less clearly anthropoid in nature.
B) The dating of both the African fossil primate Biretia and the Asian fossil primate Eosimas is so uncertain that they could easily reverse in age with more research.
C) The fossil primate record of Asia and Africa during the Eocene is so murky that discovery of new fossils that will rewrite early anthropoid history is very likely.
D) Because of the rapidity of evolutionary change,it will be impossible to sort out the evolution of anatomical differences among early fossil primates.