In Country A, the population mean height for 10-year-old girls is 55.4 inches with a standard deviation of 2.4 inches. Suppose a random sample of 15 10-year-old girls from Country B is taken and that these girls had a sample mean height of 54.6 inches with a standard deviation of 2.6 inches. Assume that heights are Normally distributed. Complete parts (a) through (c) below. . . . . . Determine the null and alternative hypotheses. Choose the correct choice below. O A. Ho: H # 55.4 O B. Ho: H > 55.4 O C. Ho: H = 55.4 Ha: H = 55.4 Ha: H = 55.4 Ha: H # 55.4 O D. Ho: H 55.4 Ha: H