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A is corrent. Stark is a secured creditor who perfected his security interest by filing on February 11. His claim on the collateral (i.e., the circuit tester, is superior to claims of Peters’ other creditors).
B is incorrect. A transfer involving a purchase money security interest is an exception to the voidable preference. Furthermore, the fact that Stark did not file until February 11 does not cause a problem because when a purchase money security interest covers noninventory collateral (such as equipment in this question), the secured party has priority if s/he files within 10 days of the debtor obtaining possession of the collateral.
C is incorrect. Secured parties do not need to join in the filing of the bankruptcy petition.
D is incorrect. Even though the filing of the financing statement took place within 90 days before the bankruptcy petition was filed, it is not a voidable preference because the transfer was in the ordinary course of business and within 45 days of the creation of the debt. This is an exception causing the transfer not to be a voidable preference.