Refer to the Following Paragraph to Answer the Questions Below

Refer to the following paragraph to answer the questions below.
Professor Howlick is studying incoming freshmen) student drinking behavior at Boozemen State University in Boozemen, Kansas. Every incoming freshman is required to have a university email address. After obtaining a list of all incoming freshmen students email addresses, he numbered every email address from 1 to 4,000. Using a random-number table, he obtained a sample of 200 freshman email addresses. He then emailed students requesting them to take an online survey. He also had two follow-up email reminders. A total of 180 students took the online survey.
-What is the population?

A) all students enrolled in Boozemen State University
B) students who drink alcohol in Boozemen, Kansas
C) all incoming freshmen at Boozemen State University
D) all students living in Boozemen, Kansas