Analysis of Various Skull Measurements from Asian and African Homo

Analysis of various skull measurements from Asian and African Homo erectus by Andrew Kramer strongly suggests that

A) all Asian and African specimens should be classified as Homo ergaster.
B) all specimens older than one million years are Homo erectus, while those younger than one million years are Homo ergaster.
C) all Asian specimens are Homo ergaster and all African specimens are Homo erectus.
D) all African specimens are Homo ergaster and all Asian specimens are Homo erectus.
E) Asian and African hominids from 1.8 million years to 500,000 years ago are all Homo erectus.