Consider two new data sets, C and D. Data Set C is formed by removing the two data points with value 10 and the two data points with value 16 from Data Set B. Data Set D is formed by adding one data point with value 10 to Data Set A. Which of the following statements about the new data sets must be true?

I. The mean of Data Set C is equal to the median of Data Set C.
II. The median of Data Set D is less than the median of Data Set A.