What are the four main determinants of investment? OA. Expectations of future profitability, interest rates, disposable income and cash flow. OB. Disposable income, interest rates, taxes and cash flow. O C. Expectations of future profitability, interest rates, exchange rate and cash flow. OD. Expectations of future profitability, interest rates, taxes and cash flow. How would an increase in interest rates affect investment? O A. Real investment spending remains unchanged. OB. Real investment spending may increase, decrease or remain the same depending on the rate of inflation. OC. Real investment spending declines. OD. Real investment spending increases