Final answer:
A short duration of activity that precedes major exercise is a warm-up, which increases heart rate and muscle temperature, includes stretching exercises, and helps prevent injuries.
Step-by-step explanation:
A short duration of activity that precedes major exercise is known as a warm-up. Warming up before intense activity, such as a sporting event or exercise session, helps to prepare the body for the increased demand that will be placed on it and aids in preventing injuries. Warm-ups commonly include activities that gradually increase heart rate and muscle temperature, as well as stretching exercises that improve flexibility and prepare the muscles and joints for movement, thus reflecting how a person accelerates their activity level similar to a car accelerating while driving. It's important to note that warming up can lead to an increase in body temperature and carbon dioxide production, as the body becomes more active and efficient at producing energy, which then necessitates cooling mechanisms such as sweating to regulate body temperature.
Warming up before an intense activity helps prepare the body for exercise by increasing blood flow, raising body temperature, and loosening up the muscles. It also helps prevent injuries by reducing the risk of muscle strains and sprains.
the correct option is B stretching