5.) I would love help on this answer and will leave positive rating! Thanks!

In statistics, what does of denote? If a simple random sample of 18 speeds of cars on California Highway 405 is to be used to test the claim that the sample values are from a population with a mean greater than the posted speed limit of 65 mi/h, what is the specific value of df? Choose the correct answer below. O A. df denotes the number of degrees of freedom. For this sample, df = 17. O B. df denotes the number of degrees of freedom. For this sample, df = 18. O C. df denotes the distribution of freedom. For this sample, df = 17. O D. df denotes the distribution of freedom. For this sample, df = 18