A high school student-athlete aiming to compete in NCAA Division I or II must register with which organization to determine their academic and amateurism eligibility?

The correct answer to the question "A high school student-athlete aiming to compete in NCAA Division I or II must register with which organization to determine their academic and amateurism eligibility?" is Option B: The NCAA Eligibility Center.

The other options — A) The College Board, C) The National Association for College Admission Counseling (NACAC), D) The U.S. Department of Education — are incorrect for this College Advising question. As explained above: The NCAA Eligibility Center is the official body responsible for certifying the academic and amateur status of all college-bound student-athletes seeking to compete in Divisions I or II.