Which of the following statements about the cost of capital is CORRECT?

a. Both the cost of debt and equity financing will increase when the Federal Reserve tightens credit.

b. Both the cost of debt and equity financing will decrease when a firm expands into a risky new area.

c. Both the cost of debt and equity financing will decrease when a firm increases its debt/asset ratio.

d. The WACC of a firm will decrease when investors become more risk averse.

e. Both the cost of debt and equity financing will decrease when a nuclear plant company encounters a ban on nuclear power generation in certain states. (I know this is wrong)

Note: As said above, I thought answer was E but I was wrong.