Final answer:
The correct answer is c. Immediately beginning a vigorous activity. It is important to warm up the body and prepare the muscles before engaging in intense physical activities to avoid injuries.
Step-by-step explanation:
The correct answer is c. Immediately beginning a vigorous activity. This is not a recommended technique for starting a physical education lesson because it can increase the risk of injuries. It is important to warm up the body and prepare the muscles before engaging in intense physical activities. A dynamic warm-up, such as stretching exercises, helps improve flexibility, increase blood flow, and reduce the risk of injury. Additionally, discussing the lesson objectives and providing safety instructions and guidelines are important steps to ensure a safe and effective physical education lesson.