Solution
✅ Correct Option: 4
The passage directly states that “Sedentary lifestyles, obesity, lack of exercise, improper posture, excessive gym training, and long hours of sitting” have increased knee-injury risk among working professionals and young adults. Option 4 matches this idea by combining prolonged sedentary behaviour with poor physical conditioning. Option 1 is wrong because the passage never mentions environmental exposure causing cartilage inflammation. Option 2 is wrong because genetic degeneration or congenital instability is not discussed. Option 3 is wrong because neurological stress and motor coordination are not given as causes. Option 4 is right because it closely reflects the lifestyle factors explicitly listed in the passage.