The owner of a large car dealership believes that the financial crisis decreased the number of customers visiting her dealership. The dealership has historically had 800 customers per day. The owner takes a sample of 100 days and finds the average number of customers visiting the dealership per day was 750. Assume that the population standard deviation is 350. At the 10% significance level, the decision is to ________.

a. rejectH0; we can conclude that the mean number of customers visiting the dealership is significantly less than 800

b. do not rejectH0; we can conclude that the mean number of customers visiting the dealership is significantly less than 800

c. do not rejectH0;we cannot conclude that the mean number of customers visiting the dealership is significantly less than 800

d. rejectH0; we cannot conclude that the mean number of customers visiting the dealership is significantly less than 800