Which of the Following Best Summarizes the Limitations Surrounding the Study

Which of the following best summarizes the limitations surrounding the study of early hominin and human civilization?

A) Early hominins developed differently according to region, and it is therefore difficult to make broad conclusions that apply to all hominin species.
B) Scientists are unable to accurately interpret evidence and are unwilling to make conclusions about early hominins.
C) There is an insufficient number of scientists to study the abundant evidence available about early hominins.
D) Evidence about early hominins is sparse and only allows scientists to make broad conclusions about the development of bipedal species.