The answer is C: require special educational services to achieve.
Explanation for each option:
a. Have a disability related to their academic progress: While having a disability can be a factor in being considered exceptional, it is not the sole criterion. The key aspect is whether the disability impacts the student's ability to progress academically and whether they need special services to succeed.
b. Be handicapped: The term "handicapped" is outdated and not typically used in modern educational contexts. More importantly, not all students who are considered exceptional are handicapped. Exceptional students can include those with disabilities, but also those who are gifted or have other special educational needs.
c. Require special educational services to achieve: This is the most accurate answer. To be legally considered "exceptional," a student must require special educational services to achieve their full potential. This encompasses a wide range of needs, including disabilities, giftedness, and other special educational requirements.
d. Have a history of school failure: A history of school failure is not a requirement for being considered exceptional. While some exceptional students may have experienced school failure, the primary criterion is the need for special educational services, not past academic performance.