Solution
The passage says that sedentary lifestyles, obesity, lack of exercise, improper posture, excessive gym training and long hours of sitting have increased knee-injury risk. This supports the inference that modern occupational and behavioural habits can make joints more vulnerable.
Option 1 is right because it draws a cautious conclusion directly from the lifestyle factors given in the passage.
Option 2 is wrong because the passage says scans and early diagnosis can help prevent long-term damage; it never says diagnosis alone can eliminate mobility disorders.
Option 3 is wrong because age-related wear and tear is presented as only one possible cause, not the sole cause.
Option 4 is wrong because the passage explicitly says these problems “are no longer limited to athletes or elderly individuals”.