Critical Reasoning (CR) | Re: OG'16 Verbal Review - For over two centuries, no one had ....

Solution: A sword maker may have recently rediscovered how to make Damascus blades using iron with trace impurities matching those in the iron from which historic Damascus blades were wrought.

Reasoning: What evidence would suggest that the trace impurities are essential for producing Damascus blades?

D is correct - The statement suggests that when the historic sword makers lost access to the special iron with its trace impurities, they could no longer make Damascus blades. Thus, it supports