The Undergraduate Students at Your University Are Classified as Freshmen

Multiple Choice

The undergraduate students at your university are classified as freshmen, sophomores, juniors, or seniors. A recent study of undergraduates asked the students to indicate the number of credits they were registered for this term. The responses were 3, 6, 9, 12, 15, and 18. The number of cells in a joint frequency distribution for the two variables, class standing, and credit hours is:

A) 4.
B) 10.
C) 24.
D) None of the above.