I need help plz it’s for AP BIO and I don’t understand this can someone help?

Savings are transferred to businesses for investment through a) banks and financial institutions b) the federal government c) major corporations d) consumer purchases e) state and local governments

Achange in any of the following factors will cause investment spending and aggregate demand to change excepta. the interest rate effect b. expected business conditionsc. real interest rate d. expected future returns created by new technology e. expected business taxes

Which of the following would be paid for with a state’s capital budget? a) lawmakers’ salaries b) a new bridge c) the salaries of state troopers d) education