Data Set A: 1, 2, 3, 4, 5, 6, 7
Data Set B: 1, 1, 2, 2, 3, 3, 4
Which of the following statements correctly compares the means of data set A and data set B?
A The mean of each data set is 2.
B The mean of each data set is 4.
C The mean of data set A is less than the mean of data set B.
D The mean of data set A is greater than the mean of data set B.