With no explanation, chose the best option from "A", "B", "C" or "D". statement in response to a discovery request, Blackwell, No. 92-42218-293, at 21, but cited no evidence that either disclaimer at issue here was altered. 11 . Section 544(b) of the Bankruptcy Code gives the bankruptcy trustee whatever avoiding powers an unsecured creditor with an allowable claim might have under applicable state or federal law. See Michael L. Cook et al., Fraudulent Transfers, 804 PLI/Comm 473, 486 (Apr. 2000). The bankruptcy trustee brought this action not under the federal bankruptcy fraudulent transfer provision, see 11 U.S.C. § 548 (1994), but under Missouri's UFTA. Accordingly, we face a pure question of Missouri law. 12 . Although not discussed by the parties, we note that our decision in Drye Family 1995 Trust v. United States, 152 F.3d 892 (8th Cir.1998) (<HOLDING>), aff'd, 528 U.S. 49, 120 S.Ct. 474, 145

A: holding that federal courts presiding over causes of action created by state law should apply state substantive law but federal procedural law
B: holding that the plaintiffs state law claims are preempted by federal law
C: holding that in diversity cases federal courts are to apply state substantive law and federal procedural law
D: holding that state law consequences of disclaimer and relationback doctrine are of no concern to operation of federal tax law
D.