As part of the civics assessment, school principals of twelfth-grade students were asked the following question about course requirements in social studies. Below is the full text of the question and the percentage of students whose principals responded within each category (data are shown only for categories where percentages rounded to a number greater than zero).
For students who will graduate this year, what is the total number of years (or Carnegie-unit equivalents) of coursework that your school or district requires in social studies?
A. None
B. One-half year
C. One year
D. Two years
E. Three years
F. Four years
G. More than four years
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