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A is corrent because documents of title (i.e., the negotiable warehouse receipts) merely represent the goods, thus a perfected security interest in the warehouse receipts (by taking possession of the documents) is also a perfected security interest in the goods covered by the documents.
B is incorrect because the debtor, Tawney, does not have to sign the security agreement if the collateral is in the possession of the secured party, Worldwide, pursuant to agreement.  When a secured party is taking a possessory security interest, an oral security agreement is sufficient to create such an interest.
C is incorrect because Worldwide does not have to file a financing statement to perfect its security interest since Worldwide has already perfected its security interest by taking possession of the negotiable warehouse receipts. Worldwide could have perfected its security interest by filing a financing statement, but this filing would not protect Worldwide against a good-faith purchaser to whom the warehouse receipts have been duly negotiated.
D is incorrect because temporary and limited relinquishment of control of the goods to the debtor is acceptable. The Uniform Commercial Code provides for a 21-day continuation of the perfected security interest in the collateral from the date of release to the debtor.