With no explanation, chose the best option from "A", "B", "C" or "D". crime. Where, as here, a defendant makes a clear argument in support of a motion to suppress and the government fails to respond to that argument, even when expressly (and repeatedly) invited by the court to do so, the argument is waived. See United States v. Teague, 443 F.3d 1310, 1314 (10th Cir.2006) (“[A] party that has forfeited a right by failing to make a proper objection may obtain relief for plain error; but a party that has waived a right is not entitled to appellate relief.”); see also Singleton v. Wulff, 428 U.S. 106, 120, 96 S.Ct. 2868, 49 L.Ed.2d 826 (1976) (“It is the general rule, of course, that a federal appellate court does not consider an issue not passed upon below.”); Rosewood Servs., Inc. v. Sunflower Diversified Servs., Inc., 413 F.3d 1163, 1167 (10th Cir. 2005) (<HOLDING>). This is especially true where the government

A: holding that issues not raised before the district court cannot be asserted for the first time on appeal
B: holding the government waived its argument on appeal that the defendant did not have standing to challenge a search when it failed to raise the argument to the district court
C: holding argument not asserted before district court is waived on appeal
D: holding the issue of standing is waived if not asserted at the district court level
C.