I will rate and love if question is done correctly. A middle school principal wants to know how many of her school's 1500 sixth, seventh, and eighth grade students are interested in a field trip. She asks every fifth student from an alphabetical list of the 450 students that went on the previous field trip. Which statements are true? Select ALL the true statements.

A - The sample includes only students who went on the previous field trip.
B - The sample is representative of the population.
C - The population is all seventh grade students.
D - The sampling method is random.
E - The sample is biased.