Final answer:
CLEP is a group of standardized tests measuring knowledge in specific subjects to allow students to earn college credits; it tests prior knowledge and is not for remedial course placement or a replacement for ACCUPLACER.
Step-by-step explanation:
The College-Level Examination Program (CLEP) is a group of standardized tests created and administered by the College Board. These assessments are designed to measure a person's knowledge of certain subjects indicating that they have achieved a level of understanding equivalent to that of a student who has completed a college course in the subject. Therefore, the correct answer to the question is C: it tests prior knowledge. CLEP exams offer a way for students to acquire college credits by proving their competency in a subject, potentially speeding up the time it takes to graduate and reducing educational costs.
CLEP is not given at the end of high school nor is it used for remedial course placement. Additionally, it is not a replacement test for the ACCUPLACER, which is another assessment that helps colleges place students in the appropriate level coursework, often for developmental or remedial courses.