Ms. Alvarez wants to determine the seventh graders’ preferences for the location of the end-of-year field trip. Which of the samples is representative of the population?
A- All students in Ms. Alvarez's fifth-period class
B- All students in Ms. Alvarez's advisory group
C- Every third student from an alphabetical list of all students in the entire school district
D- Every fifth student from an alphabetical list of all seventh graders in the school