Running Vs. Walking Running Is One of the Best Ways to Get Exercise

Running vs. Walking
Running is one of the best ways to get exercise. You do not need to join a gym or buy expensive equipment to go for a run. But you might be surprised to learn that walking can be just as good for you as running. In fact, going for a walk might be even better for you than going for a run.
Running can help lower your blood pressure and reduce your risk for heart disease. However, recent research by the American Heart Association shows that walking is just as good for your heart as running. A brisk walk can lower the risk for heart disease, high blood pressure, and high cholesterol just as much as running does. The only catch? You have to walk for twice as long as you would run. In order to get the benefits of a 15-minute run, you need to walk for 30 minutes.
Walking is just as good as running when it comes to cardiac health, but there are other ways in which walking can actually be better for you than running. Running can be tough on your body, especially your joints. In fact, a recent study published by the American College of Sports Medicine shows that as many as 40 to 50 percent of runners suffer a running-related injury every year.
Walking does have some advantages over running. However, one thing is for sure: either one is better for you than sitting on a couch!
Question: What is the best summary of the passage?

A) Both running and walking are excellent, inexpensive forms of exercise. They reduce the risk of heart disease, high blood pressure, and high cholesterol, although running can be hard on the joints.
B) Running and walking are both excellent forms of exercise. One of their distinct advantages is that they both can be performed with a gym membership and without having to purchase special equipment.
C) Running and walking are great types of exercise. But you have to walk for twice and long as you would run to achieve the same health benefits.
D) Walking and running are great forms of exercise. However, according to the American College of Sports Medicine, as many as fifty percent of all walkers and runners suffer an exercise-related injury every year.