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B is corrent because a buyer in the ordinary course of business who purchased goods from a merchant takes the goods free from any prior perfected security interest.
A is incorrect because a trustee in bankruptcy does not have priority over a prior perfected security interest. A trustee would only have priority over unperfected security interests and security interests perfected subsequent to the filing of the bankruptcy petition.
C is incorrect because a lien creditor would only have priority over an unperfected security interest or a security interest perfected after the attachment of the lien.
D is incorrect because a subsequent bona fide purchaser will not defeat a prior perfected secured interest in consumer goods for which a financing statement has been filed. Such a purchaser will only defeat a prior perfected security interest that was perfected through automatic perfection by attachment.