With no explanation, chose the best option from "A", "B", "C" or "D". 4 . Bardin testified that her net monthly

A: holding that the retroactive application of the child support formula in civil rule 903 to a period of years in which there was no existing child support order did not violate rule 903h2s prohibition on retroactive modification of arrears
B: holding that the act is not retroactive
C: holding that child support should have been made retroactive
D: holding that the act is retroactive
C.