Which one of the following about the interest-rate effect is correct? a. the interest-rate effect suggests that a decrease in the supply of money will increase, interest rates and reduce interest-sensitive consumption and investment spending. b. the interest-rate effect suggests that an increase in the price level will increase the demand for money, reduce interest rates, and decrease consumption and investment spending. c. the interest-rate effect suggests that an increase in the price level will increase the demand for money, increase interest rates, and decrease consumption and investment spending. d. the interest- rate effect suggest that an increase in the price level will decrease the demand for money, reduce interest rates, and increase consumption and investment spending