Select the correct answer. Which situation is best modeled by an exponential function with time as the independent variable? A. an investment that increases by $1 every 2 weeks B. an investment that increases by a constant factor of 1.03, or at a rate of 3%, every year C. an investment that takes 2 years to increase in value by $50 and 10 years to increase in value by $250 D. an investment that increases by $30 every year