问题详情

Which of the following, if newly discovered, would most seriously weaken the authors argument concerning the importance of virgin-soil epidemics in the depopulation of Native Americans？
A．Evidence setting the pre-Columbian population of the New World at only 80 million.
B．Spanish tribute records showing periodic population fluctuations.
C．Documents detailing sophisticated Native American medical procedures.
D．Fossils indicating Native American contact with smallpox prior to 1492.
E．Remains of French settlements dating back to the sixteenth century.请帮忙给出正确答案和分析，谢谢！