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John of Worcester, an English monk, recorded the sighting, on December ... ...

John of Worcester, an English monk, recorded the sighting, on December 8, 1128, of two unusually large sunspots. Five days later a brilliant aurora borealis (northern lights) was observed in southern Korea. Sunspot activity is typically followed by the appearance of an aurora borealis, after a span of time that averages five days. Thus, the Korean sighting helps to confirm John of Worcester’s sighting.

Which one of the following, if true, most strengthens the argument?

(A) An aurora borealis can sometimes occur even when there has been no significant sunspot activity in the previous week.  
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT71 (Dec 2013): Logical Reasoning B

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