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B is corrent. The Sales Article of the UCC applies to the sale of goods.  Although certain provisions apply only to transactions between merchants, the general scope of the Article extends to sales between nonmerchants as well.
A is incorrect. The UCC Sales Article never applies to the sale of real estate. Nor does it apply only to the sale of goods for $500 or more. Rather, it is the Statute of Frauds which generally requires that any sale of goods for $500 or more be in writing to be enforceable.
C is incorrect because it incorrectly limits the scope of the UCC Sales Article. Refer to the correct answer explanation.
D is incorrect because it incorrectly limits the scope of the UCC Sales Article. Refer to the correct answer explanation.