You can maintain a healthy body by: eating healthy foods and physical exercise.

D. Both A and C. Eating healthy foods and physical exercise are key ways to maintain a healthy body.

Eating a balanced diet that includes a variety of fruits, vegetables, whole grains, lean proteins, and healthy fats can provide the body with essential nutrients it needs to function properly. It also helps in maintaining healthy weight and reducing the risk of chronic diseases such as heart disease, diabetes and certain types of cancer.

Physical exercise is also important for overall health. Regular exercise can help improve cardiovascular health, increase muscle strength and flexibility, boost energy levels, enhance mood and mental well-being, and help maintain a healthy weight. Exercise also plays a vital role in preventing chronic diseases such as diabetes, heart disease, and certain cancers.

Staying off your feet is not a way to maintain a healthy body as it can cause physical inactivity and lead to a sedentary lifestyle which is not beneficial for overall health.