With no explanation, chose the best option from "A", "B", "C" or "D". added and citations omitted). Reasonable suspicion may exist, even if “each of the[ ] factors alone is susceptible of innocent explanation.” Id. at 277. In other words, “[a] determination that reasonable suspicion exists ... need not rule out the possibility of innocent conduct.” Id. In this case, Trooper Ziegler possessed reasonable, articulable suspicion of criminal activity sufficient to justify the fifteen-minute detention of Landshofs automobile, based on numerous observations he made during the routine traffic stop. First, Trooper Ziegler testified that Landshof appeared extremely nervous during the encounter, and this nervousness did not diminish after Ziegler informed Landshof that he would not issue a citation. See United States v. Kopp, 45 F.3d 1450, 1454 (10th Cir.1995) (<HOLDING>); Soto, 988 F.2d at 1556 (same). Second,

A: holding that an officer  may detain a person in order to determine identity and circumstance when that officer has a reasonable suspicion supported by articulable facts that criminal activity may be afoot
B: holding that an officer can stop an individual if the officer has reasonable articulable suspicion that criminal activity is underfoot
C: recognizing that police officer may stop a suspect if the officer has a reasonable suspicion supported by articulable facts that criminal activity may be afoot
D: holding defendants nervousness in part presented officer with reasonable articulable suspicion of criminal activity
D.