With no explanation, chose the best option from "A", "B", "C" or "D". CURIAM: Michael Disch appeals his convictions for mailing threatening communication, in violation of 18 U.S.C. § 876(c), and making false statements to an FBI agent, in violation of 18 U.S.C. § 1001. Disch argues that the district court judge was required to recuse himself sua sponte under 28 U.S.C. § 455(a) and § 455(b). Ordinarily, we review a judge’s decision not to recuse himself under § 455(a) and § 455(b) for an abuse of discretion. United States v. Bailey, 175 F.3d 966, 968 (11th Cir.1999); see also Parker v. Connors Steel Co., 855 F.2d 1510, 1527-28 (11th Cir.1988) (<HOLDING>). However, when a defendant fails to seek

A: holding that violation of rule 16 in that case was not harmless error
B: holding that confrontation clause violations are subject to harmless error review
C: holding that a  455b violation is subject to harmless error review
D: holding that a confrontation clause violation constituted harmless error
C.