solve both the questions and explain all

A car company says that the mean gas mileage for its luxury sedan is at least 21 miles per gallon (mpg). You believe the claim is incorrect and find that a random sample of 8 cars has a mean gas mileage of 19 mpg and a standard deviation of 2 mpg. At a = 0.05, test the company's claim. Assume the population is normally distributed. Click here to view the t-distribution table. Click here to view page 1 of the normal table. Click here to view page 2 of the normal table. State the appropriate hypotheses to test. O A. HoiUs21 OB. Ho: H= 21 Ha: [ > 21 Ha: H # 21 & C. Ho: H2 21 OD. Ho: H# 21 Ha: u