With no explanation, chose the best option from "A", "B", "C" or "D". for a R & R pursuant to 28 U.S.C. § 636(b)(1)(B). See also Fed.R.Civ.P. 72(b); D.P.R. Civ. R. 72(a); and Mathews v. Weber, 423 U.S. 261, 96 S.Ct. 549, 46 L.Ed.2d 483 (1976). Nonetheless, an adversely affected party may contest the Magistrate Judge’s R & R by filing its objections to the recommendations made. Fed.R.Civ.P. 72(b). In such respect, 28 U.S.C. § 636(b)(1), in pertinent part, provides that any party may serve and file written objections to such proposed findings and recommendations as provided by rules of court. A judge of the court shall make a de novo determination of those portions of the report or spe Cir.1993) (stating that “[objection to a magistrate’s report preserves only those objections that are specified”); Borden v. Sec. of H.H.S., 836 F.2d 4, 6 (1st Cir.1987) (<HOLDING>). The Court, in order to accept unopposed

A: holding that we review constitutional challenges de novo
B: recognizing de novo standard of review
C: holding that review of the construction of a sentencing statute is de novo
D: holding that appellant was entitled to a de novo review however he was not entitled to a de novo review of an argument never raised
D.