With no explanation, chose the best option from "A", "B", "C" or "D". AND JUDGMENT TACHA, Circuit Judge. After examining the briefs and appellate record, this panel has determined unanimously to grant the parties’ request for a decision on the briefs without oral argument. See Fed.R.App.P. 34(f); 10th Cir.R. 34.1(G). The case is therefore ordered submitted without oral argument. Defendant Marco Antonio Arreola-Najera plea 6 (7th Cir.1992) (<HOLDING>). This circuit has not resolved the issue. As

A: holding that the district courts denial of a downward departure was an exercise of discretion and therefore not reviewable
B: holding that note 9 did not authorize downward departure based on drug purity
C: holding that district court did not have authority to depart downward under note 9 based on low purity of methamphetamine involved in case
D: holding that note 9 does not preclude downward departure where defendant had no control over or knowledge of the highlevel purity of methamphetamine involved
B.