First, you should draw the local rule. Y and Z originated in Iceland. Actually, this means that WYZ came from Iceland, because WY are always together:
The question is asking for the minimum number of artifacts that come from Sweden. Let’s see if we can do zero. VX are the remaining artifacts. Can we put them both in Norway?:
There’s nothing wrong with doing this. It violates no rules. So it’s possible zero artifacts originated in Sweden. A is CORRECT.
Remember, if a diagram doesn’t violate any rules, it’s allowed.
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