With no explanation, chose the best option from "A", "B", "C" or "D". it serves. To the extent that Washington holds otherwise, we overrule it. In general, an improvement to real property permanently increases the property’s value. 21 Am.Jur.2A, Improvements, § 1 (1968); Black’s Law Dictionary (4th ed.1968). Among the relevant factors are “whether the modification or addition enhances the use of the property, involves the expenditure of labor or money, is more than mere repair or replacement, adds to the value of the property, and is permanent in nature.” Van Den Hul v. Baltic Farmers Elevator Co., 7 3 P.2d 245, 248 (N.M.1986) (same); Washington Natural Gas Co. v. Tyee Constr. Co., 26 Wash.App. 235, 611 P.2d 1378, 1381 (Wash. Ct.App.1980) (same). But see Atlanta Gas Light Co. v. City of Atlanta, 160 Ga.App. 396, 287 S.E.2d 229, 232 (Ga.Ct.App.1981) (<HOLDING>). We conclude that the service line installed

A: holding plaintiffs were properly enjoined from using excessive amounts of gas not contemplated by the free gas clause in the lease
B: recognizing implied covenant to market gas
C: holding that injury caused by criminal fleeing after stealing gas from gas station was not foreseeable result of stations policy of not requiring customers to prepay for gas
D: holding that gas line is not improvement
D.