Twenty-nine college students were asked how many states in the United States they have been to and the results are shown here. 

1, 3, 3, 5, 6, 8, 9, 10, 11, 12, 12, 12, 13, 13, 14, 15, 16, 16, 19, 21, 23, 23, 25, 25, 27, 28, 30, 30, 30 

Suppose one of the 30s in the dataset was changed to 40. Which of the following statistics would NOT change? 

A. Median 

B. Mean 

C. Standard deviation 

D. The mean, median, and standard deviation would all change.