Sunlight can penetrate a certain lake to the depth of fifteen meters the lake is five and a half times deeper than the depth of which light can penetrate in meters how deep is the lake

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.