Answer:
d. the interest rate will fall.
Explanation:
If the number of people that save money is more than the number of people that demand for investment, then production rate will reduce, and if investment demand is more than savings, production will increase. And if there is an increase in interest rate, consumption rate will fall because spending on consumption will be more expensive and consumer will prefer to save for higher interest rate.
Therefore in situations where there is an increase in saving and the interest rate does not affect the consumption rate, there will be a fall in the interest rate.