With no explanation, chose the best option from "A", "B", "C" or "D". of Congress.” Greenwood Trust, 971 F.2d at 823 (citing Rice v. Santa Fe Elevator Corp., 331 U.S. 218, 230, 67 S.Ct. 1146, 91 L.Ed. 1447 (1947)). That is so because the authority to preempt state law is “an extraordinary power ... that we must assume Congress does not exercise lightly.” Id. (citing Gregory v. Ashcroft, 501 U.S. 452, 460, 111 S.Ct. 2395, 115 L.Ed.2d 410 (1991)). According to the First Circuit ruling on the parallel FAAAA preemption question for air transport, there is a presumption against preemption when Congress legislates in a field that has traditionally been regulated by the states. Flores-Galarza, 318 F.3d at 336 (internal citations omitted). See also Hillsborough County v. Automated Medical Labs., Inc., 471 U.S. 707, 715, 105 S.Ct. 2371, 85 L.Ed.2d 714 (1985) (<HOLDING>); Medtronic, Inc. v. Lohr, 518 U.S. 470, 485,

A: recognizing presumption that state and local regulation of matters related to health and safety is not invalidated under the supremacy clause
B: recognizing this presumption
C: recognizing the 48hour standard as a department of health regulation
D: holding city may enact reasonable regulation to promote health safety and welfare of its people
A.