Hargrave Electric's stock had a required return of 12.00% last year, when the risk-free rate was 3% and the market risk premium was 4.75%. Then an increase in investor risk aversion caused the market risk premium to rise by 4%. The risk- free rate and the firm's beta remain unchanged. What is the company's new required rate of return? (Hint: First calculate the beta, then find the required return.) Do not round your intermediate calculations. O a. 17.42% b.18.39% O c 19.58% d. 16.26% e 15.63% v