With no explanation, chose the best option from "A", "B", "C" or "D". is not briefed anywhere in appellants' brief or reply brief. 6 . Rule 16 was amended effective November 1, 1999, to correspond with the 1993 amendment to rule 16 of the Federal Rules of Civil Procedure. However, the new procedures are applicable only to cases filed on or after November 1, 1999. See Utah R.Civ.P. 16 advisory committee note. Therefore, the applicable rule for the case before us is taken from the 1997 Utah Rules of Civil Procedure. . 7 . The 1999 amendment to rule 37 is also applicable only to cases filed after November 1, 1999. See Utah R.Civ.P. 37 advisory committee note. Therefore, rule 37 of the 1997 Utah Rules of Civil Procedure is the applicable rule to be applied in the case before us. 8 . See also Larsen v. Decker, 196 Ariz. 239, 995 P.2d 281, 286 (Ct.App.2000) (<HOLDING>); McAllister v. George, 73 Cal.App.3d 258, 140

A: holding that statute does not alleviate plaintiffs burden to provide additional evidence that medical bills were reasonable and necessary
B: holding trial court did not abuse its discretion in finding violation was willful and substantial
C: holding that trial court did not abuse its discretion when it found that no foundation had established bills were caused by and were reasonable and necessary results of accident
D: holding trial court did not abuse its discretion by ruling based only on affidavits
C.