With no explanation, chose the best option from "A", "B", "C" or "D". for a sentence reduction because he was sentenced as a career offender. Gibson now appeals the ruling. We are bound by this court’s decision in United States v. Moore “unless and until it is overruled by this [C]ourt en banc or by the Supreme Court.” United States v. Brown, 342 F.3d 1245, 1246 (11th Cir.2003). Where a retroactively applicable guideline amendment reduces a defendant’s base offense level, but does not alter the sentencing range upon which his sentence was based, the District Court is not authorized to grant a sentence reduction pursuant to § 3582(c)(2). Moore, 541 F.3d at 1330. This includes the situation in which a retroactive amendment to § 2Dl.l(c) would result in a lower base offense level, but the defendant was sentenced as a career offender. See id. at 1326-30 (<HOLDING>). Furthermore, we held in Moore that a

A: holding that a defendant whose original sentence was based upon the careeroffender guideline and not  2d11 could not receive a sentence reduction based on amendment 706 because it did not have the effect of lowering the applicable guideline range
B: holding that while amendment 706 was applicable to the defendants in question because it reduced their base offense levels a reduction was not authorized because the amendment did not have the effect of lowering their applicable guideline ranges because of the application of the career offender guideline
C: holding a reduction in defendants sentence as a career offender was not authorized under  3582c2 because amendment 706 did not lower his applicable guideline range under the careeroffender guidelines
D: holding that while amendment 706 was applica ble to the defendants in question because it reduced their base offense levels a reduction was not authorized because the amendment did not have the effect of lowering their applicable guideline ranges because of the application of the career offender guideline
A.