If the Campus Bookstore Wanted to Understand the Textbook and School

If the Campus Bookstore wanted to understand the textbook and school supplies needs on the campus of the Ohio State University, the population of study would be

A) the faculty and staff of the Ohio State University.
B) all college-aged adults in the state of Ohio.
C) all the people who live in Columbus and surrounding areas.
D) undergraduate students at the Ohio State University.
E) all students, faculty, supporters, and staff of the Ohio State University.