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A vice principal wanted to investigate student opinion about a possible change in the high school schedule for the upcoming school year. The vice principal selected random samples of $30$ freshmen, $30$ sophomores, $30$ juniors, and $30$ seniors to get their input about the possible change.

Which of the following best describes the vice principal's sampling plan?

A

A convenience sample.

B

A cluster sample.

C

A stratified random sample.

D

A simple random sample.

E

A systematic sample.

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