The Historical Returns for the Past Four Years for Stock

The historical returns for the past four years for Stock C and the stock market portfolio were Stock C: 10 percent, 30 percent, 20 percent, 20 percent; market portfolio: 5 percent, 15 percent, 25 percent, 15 percent.Calculate the beta of Stock C.

A) 0.86
B) 0.50
C) 1.50
D) 0.38