The data to the right show the average retirement ages for a random sample of workers in Country A and a random sample of workers in Country B. Complete parts a and b. Country A Country B Sample mean 64.3 years 67.1 years Sample size 40 40 Population standard deviation 4.5 years 5.1 years a. Perform a nypothesis test using a = U. 10 to determine IT the average retirement age in Country B is nigner than It is in Country A. Let population 1 be the workers in Country A and population 2 be the workers in Country B. Identify the null and alternative hypotheses. Choose the correct answer below. O A. HO: H1 - H2 =0 OB. HO: H1 - H2 >0 Hy : H 1 - 12 # 0 H1: H1 - 12 50 OC. HO: H1 - H2 SO OD. HO: H1 - 12 0 H1: 1 1 - H2 20 OE. HO: M1 - H2 20 OF. HO: H1 - 12 # 0 H1: H1 - H2