A forecast of 12-month return on the S&P 500 index is 12%. With a 5% annualized yield on the 90-day Treasury Bills, the beta of the U.S. stock market portfolio is

a. 7.5%

b. 3%

c. 2.14

d. 1

if using calculator named Ba 2 plus Texas Instruments is possible, please offer the answer using it.