Concept:Yoga is a holistic practice that integrates physical postures, breathing techniques, and mental focus to improve overall well-being. Its primary benefit is health enhancement.Explanation:People around the world do yoga because it keeps them healthy. Yoga involves gentle stretching and strengthening exercises. It also improves flexibility, posture, and breathing. Regular practice reduces stress and boosts mental calmness. These combined effects lead to better physical and mental health. While yoga can also bring happiness and is a simple exercise, its main widely recognized advantage is health maintenance. Option B correctly states this core reason.Answer:B. it keeps people healthy