Answer:
The correct answer is - option a. To gradually increase the intensity of training program to reduce the chance of injury.
Explanation:
The principle of progression is one of the training principles that help to develop a fitness program to increase physical fitness, performance, and skill with safety and without any injury.
It states that athletes who want to improve their physical fitness need to gradually increase the intensity to reach an optimum level of overload to avoid injury and get the desired physical fitness and skill.