Q6 i need help on the steps

Location is known to affect the number, of a particular item, sold by HEB Pantry. Two different locations, A and B, are selected on an experimental basis. Location A was observed for 18 days and location B was observed for 18 days. The number of the particular items sold per day was recorded for each location. On average, location A sold 39 of these items with a sample standard deviation of 9 and location B sold 55 of these items with a sample standard deviation of 6. Does the data provide sufficient evidence to conclude that the true mean number of sales at location A exceeds the true mean number of sales at location B at the 0.01 level of significance? Select the [Alternative Hypothesis, Value of the Test Statistic].

a) [_{1 2} 0, t = 6.276]

b) [_{1 2} = 0, -6.277]

c) [_{1 2} 0, -0.6277]

d) [_{1 2} > 0, t = 6.276]

e) [_{1 2} < 0, t = 6.276]

f) None of the above