A Sociologist Studying Freshmen at a Major University Carried Out

A sociologist studying freshmen at a major university carried out a survey, asking (among other questions) how often students went out per week, how many hours they studied per day, and how many hours they slept at night. Which of the following strategies will provide a simple random sample?

A) Contacting the registrar and obtaining a list of all freshmen, from which a random sample will then be selected.
B) Using the enrollment list of the introductory class and selecting all the freshmen.
C) Using the class list of the introductory class and randomly selecting a fraction of the students enrolled.
D) Using all the students in the class because, after all, they resemble typical students at the university.