A stock analyst wondered whether the mean rate of return of financial, energy, and utility stocks differed over the past 5 years. He obtained a simple random sample of eight companies from each of the three sectors and obtained the 5-year rates of return shown in the accompanying table (in percent). Click the icon to view the data table. (a) State the null and alternative hypotheses. Choose the correct answer below. O A. Ho: at least one of the means is different and H1: Hfinancial = Henergy Hutilities X Rates of return O B. Ho: Mfinancial = Henergy = Hutilities and H1: at least one of the means is different O C. Ho: Hfinancial = Henergy and H1: the means are different O D. Ho: Hfinancial = Henergy Hutilities and H1: Hfinancial "Henergy