With no explanation, chose the best option from "A", "B", "C" or "D". claim was procedurally barred because the state court had rested its decision on an independent and adequate state ground— failure to comply with the contemporaneous objection rule—and because cause and prejudice were not shown. On appeal, Mercado challenges the district court’s finding. He concedes the procedural default, but asks this Court to find cause and prejudice. See Coleman v. Thompson, 501 U.S. 722, 750, 111 S.Ct. 2546, 115 L.Ed.2d 640 (1991) (requiring a showing of “cause for the default and actual prejudice as a result of the alleged violation of federal law”). He identifies the court’s interference with his trial counsel’s efforts to make a contemporaneous objection as “cause” for the default. See Murray v. Carrier, 477 U.S. 478, 488, 106 S.Ct. 2639, 91 L.Ed.2d 397 (1986) (<HOLDING>). We find no such interference, and no other

A: holding that consideration of a claim in a petition for habeas corpus can be barred by failure to comply with state procedural rules
B: holding that exclusion of defense witness does not violate sixth amendment where defendant failed to comply with discovery rule requiring that witnesses be identified before trial
C: holding that cause exists where some objective factor external to the defense impeded counsels efforts to comply with the states procedural rule
D: holding that failure to comply with state contemporaneous objection rule bars federal review absent a showing of cause and prejudice
C.