According to the Harrod–Domar model of economic growth, the rate of growth is determined by the savings ratio and the capital-output ratio. Consider four developing economies with the following characteristics:

• Economy A: Savings ratio of 10%, Capital-output ratio of 4.0
• Economy B: Savings ratio of 15%, Capital-output ratio of 3.0
• Economy C: Savings ratio of 12%, Capital-output ratio of 2.5
• Economy D: Savings ratio of 18%, Capital-output ratio of 4.5

Which economy is predicted to achieve the highest rate of economic growth?