Linear Application: The equation V=34.2+2.9x gives the value (in thousands of dollars) of an investment after x months. How should the slope of this equation be interpreted in this situation?

A) The slope represents the initial investment amount.
B) The slope represents the rate of change in the investment value per month.
C) The slope represents the total value of the investment after x months.
D) The slope represents the average rate of return on the investment.