Relevant evidence is generally defined as information that has the tendency to make a fact more or less probable than it would be without that evidence.
From the options you've provided:
-
Someone's opinion on the issue - This may or may not be relevant, depending on the context. Opinions aren't usually considered strong evidence unless supported by facts or expert knowledge.
-
Facts about a different issue - Generally not relevant, as they do not pertain directly to the issue at hand.
-
Facts found in an article about the issue - This is likely to be considered relevant evidence, as it pertains directly to the issue being discussed.
So, the best choice for relevant evidence from your options would be "Facts found in an article about the issue."