What are the choices for it
I assume that the question is not necessarily directed at people, but that it can refer to the training of animals, such as dogs.
The most effective kind of reward is food and praise - and this is in fact the kind of reward most commonly used in dog training.
Planes need speed to take off and cars need a little bit of speed to take off in a flash in a snap
Answer is a
protection from costs of unplanned events
It ensures because it repeats over and over again.
