Historian: Frobisher, a sixteenth-century English explorer, had soil samples from an island in Canada assessed for gold content.
The assessments found high gold content, and Elizabeth I consequently funded two mining expeditions, which were both unsuccessful.
Modern analysis of the island’s soil indicates much lower gold content than Frobisher’s reports indicated, and some scholars have therefore hypothesized that the methods used to assess the gold content of Frobisher’s samples were inaccurate. This conclusion would be reasonable only if one could be sure that neither Frobisher nor anyone else had added gold to the samples before they were assessed.
In the historian’s argument, the two
boldfaced portions play which of the following roles?
The argument is about a discrepancy: Frobisher’s samples seemed to show high gold content, but modern analysis of the island’s soil shows much lower gold content. The issue is how to explain that discrepancy. Some scholars say the original assessment methods were inaccurate; the historian says that explanation is not secure unless sample tampering is ruled out.
So both boldface portions are evidence creating the puzzle, and the argument discusses
which explanation of that puzzle is justified.
A. The first provides evidence in favor of the historian’s position; the second presents evidence that has been used to support an opposing position.
This is incorrect. The first does not support the historian’s position by itself. Together, the two boldface portions create the discrepancy being explained.
B. The first provides evidence in favor of a hypothesis that the historian critiques; the second provides evidence against that hypothesis.
This is incorrect. The first does not support the hypothesis that the assessment methods were inaccurate; the discrepancy between the first and second does.
C. The first provides evidence that has been used to support one of two alternative courses of action; the second is a reason given for abandoning that course of action.
This is incorrect. The passage is not about choosing or abandoning a course of action.
D. The first and the second are both pieces of evidence that the argument characterizes as discredited by the circumstances in which they were obtained.
This is incorrect. The argument does not discredit both pieces of evidence. It questions one proposed explanation of the difference between them.
E. The first and the second are two pieces of evidence that point to a discrepancy, the explanation of which is the issue that the argument addresses.
This is correct. The first says the original assessments showed high gold content, while the second says modern analysis shows much lower gold content. The argument then addresses how that discrepancy should be explained.
Answer: (E)