Which of the Following Statements Is True About Combining Categories

Which of the following statements is true about combining categories in a grouped frequency distribution?

A) Always create groupings that have fairly even numbers of cases per category.
B) It is usually preferable to create groupings with uneven numbers of cases per category.
C) It doesn't matter how categories are combined; all that matters is that the number of categories is reduced.
D) The best way to combine categories will vary, depending on the meaning and practical implications of a particular variable and the way the data are distributed for that variable.