Frobisher, a sixteenth-century English explorer, had soil samples from Canada
’s Kodlunarn Island examined for gold content. Because high gold content was
reported, Elizabeth I funded two mining expeditions. Neither expedition found
any gold there. Modern analysis of the island’s soil indicates a very low
gold content. Thus the methods used to determine the gold content of Frobisher
’s samples must have been inaccurate.
Which of the following is an assumption on which the argument depends?
(C) The methods used to assess gold content of the soil samples provided by
Frobisher were different from those generally used in the sixteenth century.
(E) Gold was not added to the soil samples collected by Frobisher before the
samples were examined.
想请问这题混淆选项C要怎么排除呢?
如果F的评估方法不一样，不是可以当作assumption来support conclusion?
谢谢~~