With no explanation, chose the best option from "A", "B", "C" or "D". (“U”) denial of his application for asylum and withholding of deportation. Because the transitional rules apply, see Kalaw v. INS, 133 F.3d 1147, 1150 (9th Cir.1997), we have jurisdiction pursuant to 8 U.S.C. § 1105a(a). We review for substantial evidence the agency’s adverse credibility finding, see Singh-Kaur v. INS, 183 F.3d 1147, 1149-50 (9th Cir.1999), and we deny the petition for review. The agency properly based its adverse credibility determination on observations of Singh’s demeanor and on Singh’s failure to provide convincing documentary evidence despite his own testimony that such evidence was available and despite a continuance of almost one year designed to allow Singh to collect pertinent evidence. See Mendoza Manimbao v. Ashcroft, 329 F.3d 655, 661-62 (9th Cir.2003) (<HOLDING>); Sidhu v. INS, 220 F.3d 1085, 1092 (9th

A: holding that an agencys determination on a workers compensation claim was entitled to deference
B: recognizing trial courts ability to ascertain the demeanor and credibility of expert witness
C: recognizing that courts give special deference to the agencys eyewitness observations of demeanor
D: holding that deference is owed to state agencys interpretation of state law
C.