Best Method for Measuring Learners' Understanding

C.

The best method for measuring the level of understanding over the course material is to deliver a pre-test covering the course objectives. This will allow the instructor to assess the learners' knowledge and understanding of the subject matter before the course begins.

Option A, asking the learners about their level of understanding, may not provide an accurate reflection of their knowledge. Some learners may overestimate their understanding of the material, while others may be hesitant to admit that they do not understand certain concepts.

Option B, assuming the class has a medium level of understanding, is not a reliable method for assessing the learners' knowledge. It is important for the instructor to have an accurate understanding of the learners' current level of knowledge to tailor the course material and teaching approach accordingly.

Option D, asking another instructor who has taught the learners before, may provide some insights into the learners' previous performance, but it may not reflect their current knowledge and understanding of the subject matter. Additionally, different instructors may have different teaching approaches and assessment methods, which may not align with the current instructor's methods.

Therefore, delivering a pre-test covering the course objectives is the best option as it provides an objective and standardized method for measuring the learners' level of understanding. Based on the results of the pre-test, the instructor can identify areas where the learners may need additional support or focus their teaching efforts on more advanced topics.