Final answer:
The best way to ensure a unit test on nutrition has content validity is to match the test questions with the material taught in the unit.
Step-by-step explanation:
To ensure that the unit test on nutrition has content validity, the best approach would be B. Match the test questions with the outline of the material that was taught in the unit. Doing so ensures that the assessment accurately reflects the curriculum and what students were expected to learn. Creating a test that aligns with the instructional objectives and materials covered provides a relevant measure of students' understanding of the subject matter. While having another teacher review the test, arranging make-up tests, double-checking answer sheets, and requiring written exercises for incorrect responses all have their merits, they do not directly contribute to the content validity of the test as effectively as matching test questions to the unit's outline.