With no explanation, chose the best option from "A", "B", "C" or "D". (<HOLDING>). Further, the order does not determine child

A: holding that conditional sales of patented devices are not per se illegal but remanding to the district court to determine if the sales at issue were actually conditional
B: holding that new york common law must be applied to determine whether the parties formed an oral settlement agreement and state statutory law must be applied to determine whether the agreement if any is enforceable
C: holding conditional reservation of jurisdiction allowing parties to determine whether additional judicial labor would be necessary rendered order nonfinal
D: holding that plaintiff was not required to exhaust its administrative remedies before the puerto rico labor relations board before invoking the jurisdiction of the federal courts to determine whether the boards assertion of jurisdiction was proper
C.