A1 quart container of oil cost $2.89 a case of 12 1 quart containers cost $28.56 how much is saved per container by buying the oil by the case

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.