Final answer:
Simulation is the most useful training delivery method when trainees lack any knowledge of the topic and may possess attitudes or habits contrary to desired objectives.
Step-by-step explanation:
The training delivery method that would be most useful when trainees lack any knowledge of the topic and may possess attitudes or habits contrary to desired objectives is C. Simulation. Simulation allows trainees to practice and experience real-life scenarios in a controlled environment. It helps them develop the necessary skills and attitudes through immersive and interactive learning experiences. For example, a flight simulator can be used to train pilots who are new to flying and need to learn the necessary skills and behaviors for safe and effective flying.