The passage is not an argument because it lacks an inferential claim. Instead, it presents the reason that presents some facts. This passage is an explanation.
An inferential claim makes a conclusion based on the premise. A factual claim presents the premises as a fact without any connection to the conclusion.
Every argument has some evidence to support the claim in the conclusion. The purpose of presenting evidence in an argument is to establish the basis for believing that the conclusion is true.
On the other hand, an explanation does not require evidence to support the factual claim.
Thus, that the barns are traditionally painted red based on the fact that farmers tinted their pain with iron oxide is not an argument based on an inferential claim. It is an explanation based on a factual claim.
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