The 2016-2017 tuitions (in thousands of dollars) of 4-year, private, not-for-profit universities and colleges are described by the density histogram in the figure. The observations are rounded to the third decimal place. Complete parts (a) through (e) below. a. What variable is described by the histogram? Is it discrete or continuous? What variable is described? A. The tuition (in dollars) of a 4-year,private, not-for-profit university or college B. The tuition (in thousands of dollars) of a 4-year, private, not-for-profi university or college C. The density of the tuition (in thousands of dollars) of a 4-year, private, not-for-profit university or college D. The density of the tuition (in dollars)of a 4-year, private, not-for-profit university or college