Final answer:
To get an Ontario bus license, you must pass an on-road test, a knowledge test, and a vision test; 'c. All of these tests' is the correct answer.
Step-by-step explanation:
To obtain an Ontario bus licence, you must pass several tests to ensure your capabilities as a bus driver. The tests include: a. An on-road test, to assess your practical driving skills in a bus; b. A knowledge test, which evaluates your understanding of the rules of the road, bus safety procedures, and other relevant regulations; c. All of these tests, meaning that both the on-road and knowledge tests are necessary; and d. A vision test, to make sure you can see well enough to operate a bus safely. Therefore, the correct answer to the question is 'c. All of these tests', because you need to demonstrate proficiency in your knowledge, driving skills, and visual acuity to qualify for a bus license in Ontario.