问题详情

Which of the following can be inferred from Paragraph 1 about human ancestors？
A．They became predominantly right-handed when they began to use tools.
B．It is difficult to know with which hand they normally used tools.
C．They had been predominantly right-handed for over a million years.
D．They were more skilled at using both hands than modern humans.请帮忙给出正确答案和分析，谢谢！