Which of the Following Is a Conclusion Drawn from Comparing

Which of the following is a conclusion drawn from comparing Homo erectus remains?

A) This species must have evolved and spread very quickly as there is almost no variation from specimen to specimen.
B) As the species spread from Africa,Homo erectus became smaller and smaller over time,so the Asian specimens are the smallest and the African ones are the largest.
C) This taxon exhibits a high degree of variation,with some very gracile features and some very robust features.
D) This species is the most gracile of all of the hominins,less robust than both Australopithecus and modern humans.