A recent random sample of 12 babies with a disease was gathered, and their weights (in pounds) on their first birthday were recorded and are as follows:

17.3 17.7 18.1 18.3 18.6 18.9 19.2 19.2 19.6 19.9 20.2 20.4

Calculate a 90% confidence interval for the average weight for babies with this disease on their first birthday.

A. (18.439, 19.461)

B. (17.945, 19.032)

C. (17.3, 20.4)

D. (17.7, 20.2)