The data shows the number of salad wraps sold on each day for two weeks at a sandwich shop. Week 1: 15, 13, 14, 14, 13, 12, 13
Week 2: 18, 3, 15, 15, 16, 14, 16

Which statement about the data is true?

a. The mean of Week 1 data is a good estimate of the sandwich shop's daily sales.

b. The mean of Week 2 data is a good estimate of the sandwich shop's daily sales.

c. Both the mean of Week 1 data and the mean of Week 2 data are good estimates of the sandwich shop's daily sales.

d. Neither the mean of Week 1 data nor the mean of Week 2 data is a good estimate of the sandwich shop's daily sales.