In the 160 years in which "handedness" has been studied we have learned quite a lot, but w

In the 160 years in which "handedness" has been studied we have learned quite a lot, but we still cannot precisely describe what causes humans______to use one hand over the other, or why human populations are______toward right-hand use rather than left-hand use.

A．infrequently… prejudiced

B．habitually… neutral

C．preferentially … biased

D．perennially … disinterested

E．invariably … indisposed

请帮忙给出正确答案和分析，谢谢！

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