Final answer:
Objective-referenced tests measure whether a student has mastered a designated body of knowledge.
Step-by-step explanation:
The measure that determines whether a student has mastered a designated body of knowledge is b) Objective-referenced tests. These tests are designed to assess a student's knowledge based on specific learning objectives and outcomes. Unlike norm-referenced assignments, which compare a student's performance to others, or multiple-choice tests, which can serve various purposes including assessment of understanding, objective-referenced tests specifically aim to measure mastery of content. State assessments may incorporate elements of objective-referenced testing but are influenced by varying state standards, and their primary purpose is often to evaluate overall school performance rather than individual student mastery.