A local school newspaper's editor wants to survey students to determine the approval rating of the current student council president. How would the newspaper apply the cluster sampling method to find this information? A. The newspaper staff surveys only the female students in the entire school.
B. The newspaper staff surveys random students from every grade in the school.
C. The newspaper staff surveys every student in a randomly selected grade.
D. The newspaper staff surveys 30 students from each grade in the school.