With no explanation, chose the best option from "A", "B", "C" or "D". This Court has recognized that “courts will not hold conduct to constitute a nuisance where authority therefor exists by virtue of legislative enactment.” Smith v. Tenn. Valley Auth., 436 F.Supp. 151, 154 (E.D.Tenn.1977); accord N.C. ex rel. Cooper v. Tenn. Valley Auth., 615 F.3d 291, 309-10 (4th Cir.2010) (operation of TVA power plants under permits required by Congress and the EPA cannot be deemed a public nuisance). Here, the TVA Act authorizes TVA to acquire and construct transmission lines and distribute electric power, and affords TVA those powers that may be necessary or appropriate to exercise that right. See 16 U.S.C. §§ 831c(g)-(j), 831d(i); see also 16 U.S.C. § 831k, 831x. Thus, the conduct complained of in the complaint cannot constitute a public nuisance. Accord id. (<HOLDING>); Morris v. Tenn. Valley Auth., 345 F.Supp.

A: holding that it is the legislative authority of the union that must  make an act a crime
B: holding that the construction of a hydroelectric generating facility could not constitute a nuisance because it was being constructed under legislative authority
C: holding that to negate coverage under an exclusion insurer must show that its construction is the only construction that could fairly be placed thereon
D: holding ordinary and necessary concomitants to operating railroad terminal authorized by specific grant of legislative franchise not nuisance
B.